Did a Ghost Really Show Up?.
While in vacation, Ayumi tries to teach Haruo to swim but he tells a ghost story to her as an excuse to go back home and ends up being hit. Afraid of getting too much attention from the class, she takes Haruo to the pool nearby but is attacked and Haruo turns into ectoplasm. They all team up to get Haruo back and encounter a ghost spirit. They are able to defeat her at the end and turn her into a doll with the swimsuit she always wanted to wear.