Niina Masayoshi is the leader of DCU. The group was newly created by the Japan Coast Guard and stands for Deep Crime Unit. Their mission is to find evidence and dead bodies hidden underwater, that are crucial to solving criminal cases. Niina Masayoshi never gives up investigating the truth.

Hiroshi Abe, Ryusei Yokohama, Mikako Ichikawa, Anne Nakamura, Shuri, Ikusaburo Yamazaki, Koji Kikkawa, Mitsuomi Takahashi, Shota Shunputei, Norihiko Tsukuda