When Kiyotaka enters an elite government-sponsored high school, he finds out just how merit-based this education system is.
Located in the center of a remote island, the Abyss is the last unexplored region, a huge and treacherous fathomless hole inhabited by strange creatures where only the bravest adventurers descend in search of ancient relics. In the upper levels of the Abyss, Riko, a girl who dreams of becoming an explorer, stumbles upon a mysterious little boy.
The moment Miou Aida first met Haruki Serizawa at the Sakuragaoka High School Entrance Ceremony they both felt an unexplainable connection. Despite their completely different personalities, they found themselves walking home together after school every day. As they spend more time together, their feelings for each other grow stronger.
