The three of them have always been good friends, but Tomoki and Koichi begin to feel strongly about Rimu as being of the opposite sex. Rimu also recognizes the two as being of the opposite sex, and since her parents are away, she invites them to come and play with her. Tomoki and Koichi had a tacit agreement that they would not run away with Rimu. However, Rimu is very interested in naughty things and is frustrated that Tomoki and the others want to attack her, but they won't let her touch them.