On an ocean-covered planet dotted with the ancient ruins of giant weapons, the Izanagi Federation launched a doomed military expedition to conquer the Key of Sandalphon. In the present day, the supersoldier mech pilot who 'died' on that mission has assumed a new ordinary life as a dock worker named Toshiaki Mizushima. But everything changes when Toshiaki receives an invitation from a beautiful and flirtatious male entertainer named Axellion Aihara…