Aquarium wa Odoranai
アクアリウムは踊らない
Suzu and her childhood friend Lulu go to the famous Bianca Aquarium, but Lulu vanishes without explanation. Searching for her, Suzu explores the aquarium, which becomes a dangerous place. She is confronted by a woman who calls herself "Retro." The only way to escape, Suzu learns, is to transform into one of the aquarium's creatures.