The story of a Japanese sub's last mission during WWII.

Katagiri, a highly ambitious young detective, teams up with older detective Takiguchi, who is about to retire, to investigate a murder that took place by Sumida River. Katagiri is annoyed by Takiguchi's pushiness, but is surprised to hear that the victim was a suspect in the 300 million yen robbery.

A story about the disappearance of Kirishima, a star athlete of the volleyball club, and how his disappearance affects every person in school.