Himeno goes out with her cousin Shino and comes across student council president Manami Mitama and her three triplet sisters, Chiho, Chinami, and Chigusa. Shino gets defensive about how the triplets go about kissing others, which isn't helped when Mitsuyo and Inukai provide their own input on the matter.

he girls all go to the pool, where Sassassul overcomes her fear of water and understands more about Manami's sisters.