Story
Suze and her childhood friend, Lulu, visit the renowned Bianca Aquarium when the latter ends up disappearing without a trace. Determined to find Lulu, Suzu wanders through the fearful aquarium. Suddenly, she is attacked by a mysterious woman who names herself "Retro"... The only hint to escaping is to become a creature of the aquarium.
Synopsis via AniList (English).
