Satoru Tsuzaki, a black-haired and brown-eyed male, inhabits an apartment complex populated by eccentric residents. These include a landlord operating a covert sex toy shop and a self-proclaimed magical girl who routinely emerges from a depressed widow's wardrobe. Satoru develops romantic feelings for his neighbor Chiho, a widow still emotionally impacted by her husband's death approximately one year prior. Despite his strong attraction, he exhibits significant shyness around Chiho and struggles to initiate romantic advances due to his conviction that she lacks interest in him. His social inexperience is further highlighted by having never had a girlfriend.

Satoru's personal habits reflect limited domestic skills, particularly an inability to cook that leads to heavy reliance on fast food—a behavior stemming from his single status and culinary deficiencies. The apartment complex's unusual social dynamics further complicate his romantic pursuits.

A pivotal development occurs when Kanae Hasuma, a newly married tenant with a frequently absent husband, intervenes. Recognizing Satoru's struggles with intimacy and emotional expression, Kanae provides him private lessons in sexual fulfillment. Her guidance aims to build his confidence and maturity to reignite Chiho's romantic and sexual interests. This mentorship forms a significant aspect of Satoru's interpersonal interactions. The apartment complex serves as the backdrop for his attempts to navigate the complexities of his relationship with Chiho.