Miia, Centorea, and Mero learn that they have acquired too much weight as a result of Kimihito Kurusu's delectable food during a physical checkup. To make amends, Polt gives them exclusive use of her new pool and gym facility before to its official launch. However, the three ladies' competitive spirits begin to heat up, and it's not all fun and games! Meanwhile, Rachnera Arachnera gets a letter from her previous host family, in which they express their desire to meet with her and apologize for the circumstances that led to her transfer. But, as it turns out, they don't only want to apologize; they also want her back! Ren Kunanzuki, the family's daughter, arrives at the front door, and the gang must persuade her.