After its debut battle, the battleship Amanohara suffered substantial harm and required urgent mending. It sought shelter on an island hosting the Gogyou festival. Umakai Shintaro and his Raimu Unit, consisting of five girls, relished the serene ambiance of the island. Nonetheless, the opponent's existence jeopardized their tranquility. The tale details how Umakai Shintaro and his quintet of young women battled against the adversary while endeavoring to earn his love.