Shibaki and his friends go to the beach at the suggestion of Senior. There they run into the student monitors, their busty classmate Maya, and policewoman Ruri Iida. No matter how much Shibaki recommends it, Rurumo refuses to change out of her witch outfit and into a swimsuit, and it becomes clear she forgot to buy one. Chiro then sets off to bring Rurumo the perfect swimsuit. Meanwhile, Senior drags Shibaki to search through the forest for what he has claimed to be the "legendary swimsuit."