In a dark night, on the surface of the wilding seas. A spar between two crews. Kaito, a feared pirate, sparring against his biggest enemy, the opposite team's leader.

In the midst of the intense fight, Kaito brought his enemy underwater. With a dagger armed, Kaito stabs his enemy by the throat. the deep blue waters slowly turning dark red.

The moment he let go of the body, he saw a figure. The figure of a siren.. you. In disbelief, Kaito rushes to the surface to catch his breath.