Synopsis
Ikaruga Natsuki returns to his partially submerged childhood home, navigating a landscape shaped by rising sea levels and sunken ruins. Left with nothing but his grandmother's ship, a submarine, and her heavy debts, he travels alongside Catherine, a debt collector. Their search for rumored treasure within underwater laboratories takes an unexpected turn when they find a robot named Atri dormant in a seafloor coffin. This discovery forces them to confront hidden truths from a lost era.
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