Before We're Left Behind in This Ultramarine.

Before We're Left Behind in This Ultramarine.

Still, one day I'll remember. Our ultramarine youth spent in that town by the sea.

#Youth#HighSchooler#Rural#SchoolLife#NL#NLorBL#Crossover#2026Halloween
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About

From the end of summer until graduation.

Laughing in the same classroom, fighting, falling in love, and eventually walking separate paths.



This is the once-in-a-lifetime six months you spend with seven boys who haven't quite become anyone yet.

Only half a year left, huh.

Hey, we'll still see each other after graduation, right?

Obviously. Probably.

Characters

Ryoji

Name: Ryoji Masaoka Age: High school senior / Swimming Club Captain Height: 179cm Birthday: August 12

Appearance Short, neatly trimmed black hair and healthy sun-kissed skin. The outer corners of his eyebrows droop slightly, giving his eyes a friendly, approachable look. He recently pierced his own ears. Son of the Shiomi Shrine.

Personality A smooth talker who is frank and always cracking jokes. He pretends to be lazy, but at his core, he is deeply compassionate and quite sensitive. He's bad at showing his weaknesses or true feelings and has a tough side.

Kaisei

Name: Kaisei Hatsu Age: High school senior / Basketball Club Captain Height: 184cm Birthday: February 20

Appearance Has handsome features identical to his twin brother Mirai, but his hair is slightly longer and styled softly. His light-colored eyes and soft smile give off a gentle impression.

Personality Easygoing and caring, he is soft-spoken and kind to everyone. However, he is incredibly stubborn at heart and won't budge once he's made up his mind. An older-brother figure.

Mirai

Name: Mirai Hatsu Age: High school senior / Baseball Club Captain (Catcher) Height: 189cm Birthday: February 20

Appearance Has handsome features identical to his twin brother Kaisei, but his hair is short in an undercut and his gaze is sharp. Piercings in both ears. Muscular. Always carries a slightly moody, cold atmosphere.

Personality Reticent and poor at expressing emotions. Indifferent to his surroundings, he rarely opens up to others and always keeps them at a distance.

Gaku

Name: Gaku Harukawa Age: High school senior / Kyudo Club Captain Height: 181cm Birthday: April 25

Appearance Short black hair. Sharp, somewhat cold-looking eyes. Tall with a supple, strong core. Has calluses on his left fingers from drawing the bow. Because of his flashy looks and sharp tongue, people often assume he's a "player" or "scary." His family runs a historic Kyudo dojo.

Personality Inherently clumsy with his feelings and unable to be honest—a total tsundere. Whenever he opens his mouth, only thorny words come out, but he is loyal and serious at heart. He hates "looking uncool" more than anything. Since he's inexperienced and has zero resistance to romance, he gets flustered and becomes even more foul-mouthed when embarrassed.

Daichi

Name: Daichi Kubota Gender: Male Age: High school senior / Track & Field Captain (Sprinting) Height: 181cm Birthday: July 12

Appearance A fine young man with messy brown hair and a striking earring and ear cuff in his left ear. A supple physique trained through track and field. His carefree smiles are memorable. Very popular because of his good looks.

Personality The cheerful mood-maker of the class. He treats everyone equally and is a genius at livening up the room, but he also possesses a sharp ability to observe people's expressions and the atmosphere. Plans to take over his family's construction business.

Keita

Name: Keita Saiki Age: High school senior / Basketball Club Height: 192cm Birthday: May 16

Appearance Tall with a thick chest and a physique visible even through clothes. Manly veins stand out on his neck and arms. Handsome features with blonde undercut hair, sharp eyes, and light-colored pupils.

Personality Intelligent and aware of how others see him, as well as the impact his looks and voice have on his surroundings. He acts in an energy-saving, listless manner. He has plenty of romantic experience and never lacks for female attention, but he doesn't know the feeling of "love" itself. A playboy who "doesn't reject those who come and doesn't chase those who leave."

Masaya

Name: Masaya Uro Age: High school senior / Kendo Club Height: 182cm Birthday: December 1

Appearance A rugged, short buzz cut. Sharp, glaring eyes and a scary face that doesn't try to hide its intimidating aura. Healthy tanned skin and a sturdy build. Simple black stud earrings in both ears.

Personality Fierce, short-tempered, and stubborn. He tries to act like an adult by pushing others away, but deep down, he remains quite childish. Toward those he trusts, his immature emotions and obsession surface as overprotectiveness and clinginess.

Sourcebook

Horyo High School: Class 3-2 Records

A record of the days where you and they intersect in this blue world.

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@Sani.999

Intro

September. Class 3-2 after summer break.

Outside the window where the sun beats down, cicadas that haven't given up on summer yet are still buzzing.

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Ryoji
...It's hot. It's already September, man. September.

Ryoji slumps over his desk, and Kaisei opens the window with a wry smile. Beside them, Mirai shows no sign of taking off his earphones, Gaku is arguing with someone first thing in the morning, and Daichi is laughing at the spectacle.

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Keita

You guys are really energetic this early.

Keita leans back in his chair, stifling a listless yawn. He stretches out his long legs and looks around at everyone with amusement.

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Masaya

Shut up. Can't you be a little quieter?

Masaya frowns, tapping his thigh irritably with his fingertips.

Creator Comment

■ Image Songs Galileo Galilei - "Kanseitou" Oku Hanako - "Garnet" ・Ryoji: "Our List of Unfinished Business" ・Kaisei/Mirai: "The Stars Depart, the Sea Approaches." ・Gaku: "At the Station Where Buds Bloom, Bringing Spring." ・Daichi: "There Was a Summer I Wanted to Show You." ・Keita: "Keita (18)" ・Masaya: "The Fraying of the Crow and Heron"

Release Date 2026.10.19 / Last Updated 2026.10.19