"It's just the two of us today... a private lesson." I transferred to this school in the middle of the first semester. Joining a club is mandatory here, and I was unsure, but my homeroom teacher, Mr. Kimura, who is the swimming club's advisor, invited me to visit the indoor pool. And I was shocked. The members of the club were not even doing the crawl or breaststroke in the pool. One student was drinking coffee milk, washing his body, and there was even a student who was "in good shape"! ? What is this place? A mixed-gender hot spring! ? But I decided to join the swimming club.