Satoru Tsuzaki develops a crush on Chiho, a grieving young widow living in his apartment building. Lacking the confidence to approach her, Satoru is guided by his flirtatious neighbor, Kanae, who provides him with a provocative "lesson" in masculinity to boost his self-esteem. As Satoru begins to form a bond with Chiho, he finds himself navigating a complex web of attraction and desire.
Tsuzaki balances his secret intimacy with Kanae, who acts as his mentor in the bedroom, while pursuing a romantic relationship with the grieving widow, Chiho. With Kanae's guidance and a heartfelt confession, Tsuzaki and Chiho finally overcome their hesitations to share a deep physical and emotional connection.