Aquarium wa Odoranai

Suzu and her childhood friend Lulu head to the celebrated Bianca Aquarium, expecting nothing more than a pleasant day among the exhibits. Instead, the outing takes a nightmarish turn when Lulu abruptly vanishes—no warning, no explanation, not even a footprint left behind. Determined not to leave without her, Suzu presses deeper into the aquarium's winding corridors. The halls that once glittered with wonder now feel hostile and unnerving, every glowing tank and dim passage concealing something unseen. Her desperate search is shattered when a mysterious woman launches a sudden attack—introducing herself with a single name: Retro. Trapped in a place that offers no obvious way out, Suzu is left clutching one cryptic clue: the only path to escape lies in becoming a creature of the aquarium itself. To rescue Lulu and survive the dangers stalking the water, she must uncover what this strange admonition truly demands of her.