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.
Shinpei Ajiro travels home to attend the funeral of a childhood friend, and finds the remote island plagued by a sinister, supernatural force.
After college, Rikuo Uozumi, a boy without much ambition in life, takes on a job at a convenience store. The days pass by uneventfully for Rikuo until he meets his former girlfriend and classmate, but especially thanks to the unusual Haru Nonaka, and her pet raven...
