During the Obon holiday, his mother's best friend, Chisato, came to stay. His mother's best friend is just an old lady. Atsushi had no expectations, but he was instantly infatuated by Chisato's beauty. Every time his eyes landed on her sweaty neck and her boldly exposed chest, obscene fantasies came to his mind. Atsushi was really curious about Chisato, so he sneaked into the changing room to peek at her while she was taking a bath, but unfortunately he ran into Chisato.