Miia, Centorea, and Mero discover they've put on weight due to Kimihito Kurusu's cooking during a physical exam. Polt suggests they use her new pool and gym before its grand opening to tackle the issue, but their competitive sides soon emerge. Meanwhile, Rachnera Arachnera receives a letter from her past host family, who want to apologize and have her back. Ren Kunanzuki, the family's daughter, arrives at Kimihito's home and the group must persuade her to let Rachnera stay.