Ensign Yuudai Mizushima, a proud new member of the JMSDF, has always loved the stories of the ill-fated Nishimura fleet sortie into the Surigao strait, and especially his grandfather's tales of his beloved ship, the Shigure of Sasebo. While wreck diving on the shattered remains of the Shigure, this warship otaku is about to see all his dreams and nightmares come true!