第 7 集: 真奈與她的姊妹們享受泳池時光，而Suu-chan則面臨她的首次游泳體驗。
2017年8月20日 播出
Manami and her four younger sisters, Himeno and Shino, Kyouko, Nozomi, and the new student Suu-chan are on their way to spend the day at the pool! How will Suu-chan deal with her first pool experience? (Source: Crunchyroll)