During the Obon holiday, Chisato, his mother's close friend, comes to stay over. Junshi assumes she's just an older woman, nothing more—until he's instantly captivated by her beauty, helplessly drawn into her allure. With every glance at her damp neck or the daringly open neckline of her clothes, his mind grows hazy, one lewd fantasy after another flooding his thoughts. Unable to resist his curiosity, he sneaks into the changing room to spy on her bathing—but luck runs out when he's caught red-handed.