[Machine Translation] The marine battle fantasy that lights up the eyes and the sea with azure has come to a close! Ven s submarine, the *Steir*, arrives at the Brio Empire, but the two sides find themselves at odds due to conflicting interests. Grausland and Bryo, the high command and the crew. As the situation grows increasingly complex, both nations move to exterminate the dark beasts infesting Bryo but... Can humanity once again believe in the azure of the sea...? The marine battle fantasy comes to a close!