Aika is pure fanservice excess pretending to be a heist plot, and it commits so hard to the bit that you stop caring about the story falling apart. The camera is always one frame away from indecency, the comedy timing works despite the nonsense, and every character moves like they're performing rather than existing. This is what happens when someone decides to make the most fun version of a movie that has no business existing, and somehow pulls it off.
In a world drowned by catastrophic seismic collapse, Tokyo lies submerged beneath endless ocean. Aika works the murky depths as a salvager, diving through sunken ruins to recover valuable artifacts and technology from humanity's buried past. When a lucrative job lands on her desk, everything changes: locate and secure the Lagu, a mysterious object worth killing for. What should be a straightforward salvage operation spirals into chaos. Aika quickly learns she's competing against rival treasure hunters, corporate operatives, and dangerous organizations all hunting the same prize. Her quick wit and combat skills prove essential as she navigates flooded cities and underwater laboratories, piecing together clues about what the Lagu actually is and why everyone wants it so badly. Equal parts action-packed adventure and comedic mishap, the series balances high-stakes underwater heists with goofy character moments and slapstick humor. The vibrant retro-sci-fi aesthetic gives the sunken world a distinctive charm. If you crave propulsive action with chaotic energy and don't mind fanservice alongside your adventure, this cult OVA delivers pulpy fun in spades.