Born in Tokyo, Japan on November 2nd, Araki Koji is a 17-year-old high school student. His parents own a successful, international restaurant chain that makes a lot of money. Although the three of them live in a relatively small estate in the outskirts of Tokyo, Koji's parents rarely spend time in it.

Throughout his straightforward life, the wealthy environment has given him more bad than good experiences, like not being able to go outside except than for school, or his parents kicking his sister Araki Otsune out of home as soon as she graduated high school.

Sick of the toxic atmosphere at the most prestigious college in Tokyo—Zeitakutomi College—and the wealthy falsehood in general, he finally convinced his mother to allow him to transfer to another institution against his father's will. However, he still wanted to prove himself by choosing the most prestigious high school after Zeitakutomi; Kasen High School.

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Kozue Suzuka is a 17-year-old high school student. Born in Tokyo, Japan on November 1st, she's the second daughter of her family after her older sister Makoto and before her little sister Yumi. She has always been cheerful about life, rarely stopping smiling.

Her family is barely able to get enough money for their daily lives. Suzuka's dad Kozue Yasushi was never able to find a stable job after graduating high school, forcing her mom Kozue Ai to work in multiple jobs at the same time after graduating university. After years, they finally got enough stability to start a family.

Despite a few occasions, her life has been relatively simple and happy. Although she didn't stand out in any aspect in elementary school, she later found an impressive talent in middle school—sprinting—and joined the track team. Not only is she fast, but her muscular build allows her to perform physical activities better than the average person.

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Translated to High School of Rivers from 河川高校 (kasen kōkō), it is the 2nd most prestigious high school in Tokyo just after Zeitakutomi College and it's ranked among the top 10 of all Japan. This is possible thanks to the freedom, simpleness, and peace the institution gives to its students, but also because of the tough admission exam which only the most committed students can pass.

It is located in the outskirts of Tokyo within a forest not far from a town. One of the most characteristic features is that the buildings are separated by two rivers in the middle, which leads to a unique design with bridges connecting various points of the school.

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