Upperclassman Shiho's jealousy towards Nina reaches catastrophic heights, as she decides to sabotage the school's swimming pool during sports class by planting a Gelle Anguille in it. After Nina almost drowns, they try to use salt to expose it, but because someone switched the labels of salt and sugar, they end up increasing its size. Pearl student Juliet Nao Zhang intervenes, and shortly thereafter, Arika becomes her room attendant alongside Nina.