Iori Kitahara

Age: University Freshman Height: Approx. 177cm Gender: Male Black hair, slightly long, straight, worn down. A young man with sharp, almond-shaped eyes. He has handsome features and would be quite a looker if he stayed quiet, but his emotions show easily on his face, and he often makes spectacular "ugly faces" when surprised or panicked. He has a toned body built through diving and daily activities. His clothing is mainly casual. Usually, he seems like an ordinary college student, but the serious expressions he shows in fleeting moments are surprisingly cool. Characteristic: A refreshing young man "usually." In comedy scenes, his facial expressions are extremely intense. His nudity rate is abnormally high. At drinking parties, he takes on an expression as if he has abandoned humanity.

Belongs to Izu University.

Since starting diving, he has gained muscle; he is lean but muscular.

Personality

Basic Goes with the flow Helpful Cares for friends Surprisingly serious Highly adaptable

He was a sensible person at first, but as a result of adapting to his environment, he becomes increasingly eccentric.

Intelligence Iori isn't particularly good at studying, but he has: High creativity Good at lying Quick situational judgment Strong in a pinch

However, he is kind at heart and cannot leave people who are truly in trouble alone.

Hobbies/Special Skills Diving Belongs to the club Peek a Boo. He was reluctant at first, but gradually becomes fascinated by the sea itself.

Special skills include: Scuba diving Survival skills Adaptation to drinking parties etc.

Alcohol He isn't a heavyweight, but he is often forced to drink dangerous liquors like Vodka and Spirytus. In the story, he is both a victim and a perpetrator regarding alcohol.

Relationships

Kohei Imamura Best friend and bad influence. They betray and kick each other down, but they trust each other deep down.

Chisa Kotegawa Cousin. An important person who shares his passion for diving.

Shinji Tokita, Ryujiro Kotobuki The seniors who destroyed Iori's life. At the same time, they are benefactors who taught him the wonders of diving.

To describe Iori in one word: "A cheerful protagonist who is a good guy at heart but turned into a pervert because of his surroundings."

Usually, he only does trashy and stupid things, but he can get serious for the sake of his friends and comrades. That gap is the greatest charm of Iori Kitahara's character.

Kohei Imamura

Age: University Freshman Height: Approx. 178cm Gender: Male

Bright blonde hair, golden eyes. Hair is long and parted at the hairline above the left eye. When diving, he ties it back. A tall young man. Characterized by well-defined features and a sharp jawline, he has a handsome face that looks almost non-Japanese. His hair is somewhat long and flows casually, and while he has a slender build, he possesses a toned body forged by diving. A beautiful young man who gives off a refreshing and glamorous vibe like a prince.

Belongs to Izu University.

At first glance, he is a prince-like beautiful young man who looks like he stepped out of a shojo manga. However, once he opens his mouth, it's either otaku talk or perverted comments, so there is a huge gap between his first impression and his inner self.

Personality An otaku to the core.

Kohei's greatest characteristic. He dearly loves: Anime Games Idols Beautiful girl characters

His love for the 2D world is abnormal, and he truly sticks to the principle of "2D over 3D women."

Loyal in friendship Though there are many silly moments, he has a strong sense of chivalry, caring for his comrades, being dutiful, and keeping promises. He often helps Iori when he is truly in trouble.

His reason flies away when it comes to romance. He can go out of control due to jealousy toward handsome guys, hostility toward "normies," or otaku arguments.

Hobbies/Special Skills

Otaku activities Watching anime Gaming Collecting figures Attending live concerts etc. His depth of knowledge is quite profound.

Cosplay Surprisingly, Kohei has a high aptitude for cosplay. Because of his good looks, the quality of his cross-dressing or character recreations is strangely high.

Diving Belongs to Peek a Boo.

Usually an idiot, but he is serious and highly skilled during diving.

Relationship with Iori

Best "bad influence" friends with Iori Kitahara. They cooperate, betray, trap, and fight together almost every day. However, they trust each other in truly dangerous times.

To describe Kohei in one word: "A disappointing handsome guy with 100 face points, 100 otaku points, and 100 friendship points."

A man who has the looks to be popular but ruins it with all his might. Still, his care for his friends makes him impossible to hate. He calls Aina Yoshiwara "Cakey-face" (Kebako). (Triggered by Aina appearing with excessively thick makeup at the Spring Festival beauty pageant).

Chisa Kotegawa

Age: University Freshman Height: 162cm Gender: Female

Short, straight brown hair reaching the shoulders, styled like a short wolf cut with flipped ends. A beautiful girl with impressive light brown eyes. In addition to her well-defined features, she has fair, healthy skin and exudes a cool, dignified atmosphere. She has a toned body from diving and a good figure. Usually wears simple, easy-to-move-in clothes; while not flashy, her natural beauty stands out. Overall impression is that of a "neat, cool, and orthodox beautiful girl." She is a lightweight and can't drink much. If she drinks strong alcohol, she gets very drunk, her face turns bright red, and she starts blurting out her true feelings as a reaction to usually being unable to be honest.

Belongs to Izu University.

Usually gives a cool impression with a somewhat expressionless face. Not flashy, but an orthodox beautiful girl with a sense of transparency. Sister of Nanaka Kotegawa.

Personality Serious and hardworking Strong sense of responsibility Studious Bad at lying Values promises

Since those around her are rowdy, she often plays the role of the straight man.

Abnormal love for diving Her love for the sea is indispensable when talking about Chisa. Becomes talkative when discussing the sea High diving skills Knowledgeable about marine life

To the level where she prioritizes the sea over romance or hanging out. Slightly awkward socially Not good at expressing emotions, she often: Can't be honest Hides her embarrassment Doesn't put what she's thinking into words However, she is kind at heart.

Hobbies/Special Skills Diving Belongs to Peek a Boo.

Has the top-class love for diving in the series. Observation of marine life Rich knowledge of fish and sea creatures. She is more lively underwater than usual.

Relationship with Iori Iori Kitahara's cousin. At first, she treated Iori like a pervert and kept her distance, but she gradually deepens her trust while spending time together. She often takes a cold attitude, but she fully recognizes Iori's character and kindness.

Likes The sea Diving Family Serious people

Dislikes Drunkards Dirty jokes Lies Insincere behavior

To describe Chisa in one word: "A cool-type beautiful girl who loved the sea too much."

Usually calm and has an unapproachable atmosphere, but she becomes more passionate than anyone when it comes to the sea. That straightforwardness and awkward kindness are Chisa Kotegawa's greatest charms.

She is doted on by her older sister Nanaka, but Chisa herself thinks it's just normal sisterly love and doesn't suspect anything.

Aina Yoshiwara

Age: University Freshman Height: 159cm Gender: Female

Blue hair color. Short bob with short bangs. A girl characterized by large eyes. She has a soft, approachable face and a bright, cute atmosphere. She has a small and delicate build, giving a strong feminine impression overall. Usually prefers fashionable clothes, and looks like quite a beauty when she puts on makeup. With a charming appearance that suits a smile, she is an approachable, cute-type beauty, contrasting with the cool-type Chisa. Her chest is small.

Student at Omi Women's University. Despite being from another school, she joined "Peek a Boo."

Before her college debut, she had a plain appearance, but after entering university, she researched makeup and fashion to become her current self. However, she extremely dislikes having her past appearance known.

Personality Bright and sociable Can talk to anyone Helpful Can read the room Goes with the flow The type who can become friends relatively quickly even upon first meeting.

Sensible person role Since those around her are full of eccentrics, she often becomes the straight man. She gets creeped out by the nudity, the way they drink, and is exasperated by the boys' stupidity. Despite that, she likes the time spent with her comrades and enjoys herself while calling out the naked group. However, when she drinks strong alcohol, she puts on caked-on makeup and joins the rowdy party. She is a lightweight. When dead drunk, highly emotional, or upset, her local dialect comes out strongly (Kitakyushu/Hakata dialect).

Surprisingly maiden-like in romance Usually energetic, but she has a side typical of a girl her age, such as: Getting embarrassed by romance Getting jealous Getting depressed

Hobbies/Special Skills Makeup/Fashion Acquired through effort starting with her college debut. Relatively sensitive to trends.

Diving Belongs to Peek a Boo. She was a beginner at first, but gradually becomes attracted to the charm of diving.

Relationships Chisa Kotegawa Best friend. Their personalities are opposites, but they are close.

Iori Kitahara Friend. While exasperated by Iori's stupidity, they've known each other for a long time.

Kohei Imamura Sometimes they get hyped together, other times she's dragged into his pace.

Likes Friends Romance/Shojo manga Fashion Animals Diving

Dislikes Her own dark history Failures in romance Extreme eccentrics Feeling embarrassed

To describe Aina in one word: "A hardworking and approachable girl."

Inside, she is hardworking and cares for her friends. In the crazy world of Grand Blue, it's interesting to see Aina, who has relatively sane senses, gradually getting stained by that side.

Nanaka Kotegawa

Age: 23 Height: 166cm Gender: Female A beauty with long, glossy brown hair and gentle brown eyes. Her well-defined features are very beautiful, and her soft smile and calm atmosphere are impressive. She has a good figure and a healthy, toned body typical of a diving instructor. While she gives off a sense of mature sexiness and inclusiveness, she also possesses an elegant and neat atmosphere. Overall impression is that of a "gentle, big-sisterly, peerless beauty." Her soft smile is impressive, and she looks like the ideal older sister to those meeting her for the first time. Her breasts are large.

Usually wears calm clothing and has the sexiness of a mature woman.

Older sister of Chisa Kotegawa.

Personality

Her public face is gentle, helpful, a master of housework, and attentive. She is kind to Iori, treating him like a real younger brother.

When Chisa is not around, her hidden side emerges. A severe siscon, Chisa-supremacist, won't forgive anyone who hurts Chisa, her delusions run wild, etc. (Secretly sniffing Chisa's clothes, indirect kisses with glasses, etc.) She shows abnormal vigilance toward men who approach Chisa. When Chisa is present, she is a perfectly normal, kind older sister.

Hobbies/Special Skills Diving She is the poster girl and works as an instructor at the diving shop "Grand Blue" managed by her father. Her diving skills are very high, and her love for the sea is deep.

Photography She has a massive amount of photos of Chisa. The amount far exceeds the range of normal sisters. Chisa hasn't found out.

General Housework Cooking Cleaning Laundry She is good at all of them.

Relationships

Chisa Kotegawa Beloved younger sister. The center of her life. Most of Nanaka's motivations are related to Chisa.

Iori Kitahara Basically dotes on him. However, he becomes a danger if he gets too close to Chisa.

Shinji Tokita, Ryujiro Kotobuki Trusts them as diving comrades.

Likes Chisa Chisa's smile Memories with Chisa Diving

Dislikes People who make Chisa cry Dangerous people who approach Chisa Chisa getting hurt

To describe Nanaka in one word: "The strongest siscon who hides madness behind an angelic smile."

Usually a perfect older sister. However, the moment Chisa is involved, her reason flies away. That gap is Nanaka Kotegawa's greatest charm and terror.

One of the people in the series you "must not anger." The type who applies pressure while still smiling.

• Chisa hasn't realized she is being doted on to this extent. (Secretly sniffing Chisa's clothes, indirect kisses with glasses, decorating her room with tons of Chisa goods, etc.)

Azusa Hamaoka

Age: University Junior Height: 165cm Gender: Female Purple hair in a short bob. Towards the ends, it has a natural perm that seems to bounce. A woman characterized by large, clear eyes. She has healthily tanned skin and a supple body forged by diving. Her figure is very good, and her outstanding proportions especially catch the eye. Her features are well-defined. Her way of laughing is boisterous. A glamorous beauty who suits a smile. Overall, she carries a bright and open atmosphere.

Student at Omi Women's University. Despite being from another school, she joined "Peek a Boo."

She usually has a sexy vibe and gives the impression of a kind, big-sisterly beauty upon first meeting. She is treated as quite a beauty within the club.

Personality

Positive, hyped up, a party girl with excellent adaptability. While she looks like a mature, sexy beauty, her inside is a "manly, big-sisterly" type who has completely assimilated with the men of PaB. She is one of the most uninhibited, free-spirited, and strongest drinkers.

Helpful Cares for juniors Frank and friendly Basically uses casual speech Boisterous Enjoys taking care of others She treats Iori and Kohei kindly. She often acts as a confidant. Loves romance

Azusa's greatest characteristic. Loves love stories Supports other people's romance Loves seeing couples form Her tension rises when romantic events occur. Surprisingly wild Sticks her nose into anything that looks interesting

She also has parts typical of a "Peek a Boo" member.

Hobbies/Special Skills Diving Belongs to Peek a Boo. Loves the sea and has high skills. Good at teaching juniors.

Romance Observation Sensitive to romantic affairs inside and outside the club. As soon as she senses the scent of romance, she wants to intervene.

Alcohol As expected of the seniors, she is quite strong. Shows a boisterous side at drinking parties.

Relationships

Iori Kitahara Cute junior. Often teases him about romance.

Kohei Imamura Also a cute junior. Relatively understanding of his otaku hobbies.

Chisa Kotegawa, Aina Yoshiwara Dotes on them as juniors. Often acts as a romance counselor.

Likes Diving Love stories Alcohol Time with comrades

Dislikes Troublesome human relationships Comrades getting hurt

To describe Azusa in one word: "A boisterous and super energetic big-sisterly beauty."

Usually a reliable and kind senior, but her tension suddenly rises when it comes to talk of romance. She enjoys the love lives of her juniors while sincerely supporting them.

She drinks alcohol completely on par with the men (Iori, Kohei, Tokita, Kotobuki), sleeps comfortably in a room full of naked guys, participates in strip-games, and has no resistance to being in her underwear. She has completely adapted to the PaB vibe. • Misunderstanding character: She mistakenly thinks Iori and Kohei are a BL couple (convinced that Iori is in love with Kohei). Therefore, she came out to Iori thinking he's a "fellow bi" and actively moves to hook Iori and Kohei up. • Meddling & Playful: She tries to act as a matchmaker for Iori and Chisa or schemes various things for fun. She has high perception and a helpful side too. She is particularly close to Nanaka and they often consult each other. Overall, her position is "the sexy older sister who boldly mixes in with the PaB men."

Shinji Tokita

Age: University Junior Height: Approx. 188cm Gender: Male Black hair. Cropped short hair. A man characterized by a sturdy, large-boned build. Wild but has a kind atmosphere. His muscular and thick upper body is quite powerful, and his appearance strongly carries the vibe of a "man of the sea." Usually wears rough and haphazard clothes, and his appearance puts the roughness of a sports-oriented person at the forefront.

Belongs to Izu University.

His greatest feature is his physique. Everything is trained to the limit, almost like a bodybuilder. His muscles are visible even through clothes.

Personality Boisterous. His way of speaking, voice, and behavior are all boisterous. Doesn't sweat the small stuff Proactive Goes with the flow Has guts One of the central figures of the club.

Helpful Values his juniors and naturally provides: Diving instruction Counseling Follow-up He is deeply trusted by Iori and the others. Doesn't do truly dangerous things Usually makes a racket with alcohol and nudity, but he's different regarding ocean safety. Strict adherence to rules Prioritizes comrades Values life He has a serious side.

Hobbies/Special Skills

Diving Belongs to Peek a Boo. His skills are top-class in the series. Very reliable underwater.

Muscle Training Almost a part of his life. That physique is the result of years of training.

Alcohol An incredible heavyweight. He stays unfazed even with amounts that would make a normal person collapse.

Relationships

Ryujiro Kotobuki Best partner.

Iori Kitahara Cute junior. Watches over his growth while fooling around.

Kohei Imamura Also an important junior. Sometimes makes unreasonable demands but trusts him.

Likes Diving Muscle training Alcohol Comrades

Dislikes Dangerous acts in the sea People who hurt comrades Insincere behavior

To describe Tokita in one word:

"The strongest big brother ruled by nudity and alcohol."

Usually an eccentric who runs wild naked, but once he enters the sea, he is a first-class diver. He is one of the most virtuous people in Grand Blue, being the first to lend a hand if a junior is in trouble.

He is the very definition of a "respected ideal senior." A man made of muscle, alcohol, and friendship.

Ryujiro Kotobuki

Age: University Junior Height: Approx. 182cm Gender: Male

A large, well-built man with short blonde hair. Hair is styled like a center part. He leads the diving club along with his sworn ally Shinji Tokita and has a splendidly trained physique.

Belongs to Izu University.

If Tokita is a "boisterous beast," Kotobuki is a "composed ladies' man." He has a calm atmosphere and is popular with women. However, like Tokita, there is a high probability he will end up naked.

Personality

Cool-headed and composed Calm High judgment Quick-witted Hard to get emotional Sometimes acts as the brake in the club.

Actually quite an eccentric His appearance and way of speaking seem normal, but he is: A heavyweight drinker Like Tokita, his way of speaking, voice, and behavior are boisterous. Nudity is fine Loves unreasonable demands Fundamentally a resident of Peek a Boo. Not a sensible person.

Cares for juniors He treats Iori and Kohei as a big brother figure, such as: Watching over their growth Helping when necessary Instructing strictly

Hobbies/Special Skills

Diving Belongs to Peek a Boo. A top-level practitioner in the series. Provides an absolute sense of security underwater.

Alcohol A heavyweight on par with Tokita. He is one of the "disasters" at drinking parties.

Communication Affable and good at: Breaking the ice with strangers Reading the room Liven up the place

Relationships

Shinji Tokita Best partner. When these two are together, the juniors' peace disappears. But they are the strongest duo in terms of diving.

Iori Kitahara A junior he has high expectations for. Watches over Iori's growth more than anyone.

Kohei Imamura Cute junior. Doesn't really dismiss his otaku hobbies.

Likes Diving Alcohol Comrades Funny things

Dislikes Dangerous acts in the sea People who disregard comrades Irresponsible behavior

To describe Kotobuki in one word: "A man who looks like a gentleman but is completely Peek a Boo inside."

Usually a calm, mature, handsome guy. However, his true nature comes out the moment he starts taking off his clothes. Still, his passion for the sea and consideration for his comrades are real, making him one of the seniors Iori and the others look up to. If Tokita is the "boisterous big brother," Kotobuki is the "smart big brother."

A college comedy manga about naked guys disguised as a diving manga.