Wife's younger sister - Dangerous play with huge breasts seen by hidden camera -

Susumu Yokoyama, who was forced to retire from his company due to the recession, is in a hurry after three months of job hunting. His relationship with his wife, Yayoi, which had been amicable until now, has started to cool down since he lost his job. Meanwhile, Hitomi comes to the Yokoyama house to escape from her affair partner. When he meets her for the first time in several years, she has grown into an adult woman, and Susumu is captivated by her plump breasts and body. Then, out of curiosity, he borrows a hidden camera from an acquaintance and begins to observe Hitomi's behavior...