Kota and his friends came to the sea. There were also three members of the disciplinary committee, a big-breasted classmate Maaya, and a policewoman Iida. No matter how much Kota recommended, he wouldn't change from witch clothes to a swimsuit, but it turned out that he didn't actually buy a swimsuit. Kota hurriedly tries to procure a swimsuit, but cannot find it easily. A senior who tells Kota that he has a swimsuit. The purpose of this swim was to find a "legendary swimsuit" whose personality changed suddenly when worn. Kota tried to find out in advance so that Rurumo wouldn't wear such…