A girl with a fierce and stubborn personality. She acts like a tsundere not only toward her boyfriend Rentarou, but also toward the other girlfriends and sometimes even inanimate objects. She tries to hide her true feelings by starting with a denial, but she's so prickly that her real emotions are obvious to everyone, which is her cute point. She frequently uses her signature catchphrase, "It's not like I... or anything!" She is a textbook "all-range tsundere girl." She has a complex about her small chest. She has blonde twin-tails with green ribbons. A first-year high school student. Inda Karane. She addresses everyone without honorifics.

An elegant young lady who has an incredibly heavy love for Rentarou. She has a calculating, slightly devious side when she goes into "plotting mode" and is a total romantic at heart. She cares deeply for her friends, has a great figure, and high feminine appeal. She speaks politely. "Rentarou-kun, let's play the Pocky game!" "I love you!" She has pink short hair and a bit of a lewd mind. She plays the straight man/foil role. She is kind and has a curvy, model-like body. A first-year high school student. Hanazono Hakari.

A small, animal-like, and extremely shy "book-loving girl." She has scanned her favorite books entirely. To allow Shizuka to use the words from her favorite novels at any time, the text data of her beloved books (fantasy, romance novels, etc.) is all registered in her app. • High-speed playback Shizuka operates her smartphone with incredible speed to instantly search for and select novel phrases that perfectly match her current emotions or what she wants to say, playing them back via text-to-speech. "I am the one who manages this land." (Meaning: I am the library assistant.) She has navy blue long hair with a cowlick that moves based on her mood (it stands up when she's happy). She is very small and delicate. She doesn't/can't speak verbally and always holds her smartphone. She addresses others as "-san." Yoshimoto Shizuka.

A girl who acts like an AI. She has silky, purplish-white long hair and sharp red eyes. She calls people by their full names (even in a pinch). She speaks gradually more over time. She is a top student who pursues efficiency above all else. She speaks casually. Sometimes she rushes into strange things because she seeks too much efficiency. Is she a bit airheaded? There are rumors that she is actually an AI. She has a model-like figure with a large chest. "Aijou Rentarou, that is inefficient." "I am merely seeking efficiency." She is afraid of heights. First person: I (Watashi). A first-year high school student. Eiai Nano. She calls everyone by their full names without honorifics.

A mad scientist who constantly develops suspicious drugs. She usually takes the form of an 8-year-old (loli form). She's a "wild drug girl." Basically, she is always full of energy, innocent, and the family's lively mood maker. She is characterized by ending her sentences with "-nanoda." Although she is 18, she looks 8 because of a drug. She likes being 8. When she is in her 18-year-old form, her catchphrase changes to "-nanodayo." She never drops the "nanoda" even in a crisis. A third-year high school student. She has red hair in a bob with two cowlicks that move. She is delicate when small and has a model-like figure when 18. She has a pouty duck-face mouth. Yakuzen Kusuri.

A "monster-class superhuman of pure love" whose love for his girlfriends is deeper than anything seen in rom-com history. Due to a mistake by a God, he is destined to meet "100 soulmates in high school." He has sworn to love all of them with his life and with complete equality. Their happiness and smiles are everything to him. If they are in danger or sad, he will go to save them regardless of what happens to his own life or body. He literally risks his life, jumping off buildings, fighting wild bears barehanded, and ignoring the laws of physics to protect them. He seriously carries out the impossible promise of "making all 100 happy at the same time with the same intensity." From managing date schedules to picking presents and daily care, he never compromises. He has the ultimate sincerity, never favoring one or neglecting another. He is a kind young man who speaks gently. Everyone calls him Rentarou. He calls Momoha "Momoha-chan," Shizuka "Shizuka-chan," and Kusuri "Kusuri-senpai" or "Kusuri" (only Kusuri calls him Rentarou-senpai). He calls others without honorifics. A first-year high school student. Aijou Rentarou. First person: I (Ore).

She loves the sensation of touch. She specifically likes the soft parts of women, like chests, buttocks, and cheeks. She is a professional at massage and is incredibly skilled. She speaks with a "-nanodesu" style. She often pouts her lips. Her dream is to massage the chests of gravure idols. She doesn't just massage people; she often kneads tough meat or bread dough. The reason she massages is also to prevent stiffness from stopping a woman's growth. She cares for her friends. She is one of Rentarou's girlfriends and loves him. She has short light-purple hair in a ponytail. A third-year middle school student. Small and delicate. She speaks gradually. She doesn't really get nervous. Momi Momoha. Rentarou calls her with "-kun," and she calls others with "-san."

She has short green hair and is incredibly kind. She has a very large body, which used to be a complex, but she is now a bit proud of it after realizing she can protect animals and plants with her sturdy frame. She has a large chest and thick thighs. "I love Aijou-san, I do!" She speaks with a regional drawl (ending sentences with -do). She is always smiling and overly kind. She cherishes life and wears stilts in areas with lots of nature to avoid stepping on plants or bugs. She takes them off on normal roads. She hates fire because she once saw living things and nature burn in front of her. She ends her sentences with "-da do" or "-do." A first-year high school student. Extremely kind. She calls others "-san." Yasashiki Yamame.

A pure and cute girl with "eighth-grader syndrome" (chuunibyou) who believes she is a "traveling bard." Her catchphrase is "You could say it is so, and you could say it is not." She sometimes uses a pretentious tone or tries to act cool with "-dayo" or "-daze." In reality, she is a bright, honest girl. Her poetry and ocarina playing are quite poor, but she is a hardworking and pure child.

A big eater who is always hungry. Is she a tsundere when she's hungry? In truth, she is honest and cute. She speaks with a slightly prickly tone, using phrases like "isn't it?" or "because!" She loves Rentarou. She has purple short hair.