After losing her husband, Shinobu has supported herself by running a boarding house in her only asset—an old wooden house—while preserving her modesty. However, Oki, one of the lodgers living under her roof, unaware of her age, finds himself unable to suppress his urge to embrace her, and masturbates daily while fantasizing about Shinobu's body. Surrounded by young students, the widow's intimate parts gradually begin to grow wet. Her changing physical state mirrors the subtle transformation taking place within her heart.