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Caretaker, let's have sex... ~ A married woman who definitely wants to have sex vs. a caretaker who definitely shouldn't have sex

A young man, Kamiya, a poor student, is working away from his hometown on the condition that his relatives give him a job as a caretaker of an apartment building as a live-in worker. He is working away from home when he encounters Tamano, a married woman who works at the store, who has injured her back while trying to carry a package.
Kamiya, a naturally good-natured man, takes care of her and carries her luggage into her room, but when Tamano's back pain persists and she asks him for a massage... Jinya cannot contain his excitement at the sight of Tamano's vulnerable and sexy body, which is aching with pain due to the difficulties she is having with her husband.
The massage gradually moves on to the sensitive area at the base of her legs...?
As he gets more and more excited by the sight of Tamano's body, he can't stop himself from getting excited by the sight of Tamano's body, which is still tingling and aching, and her unprotected and sexy body.