Masakazu business ventures failed big time and he returned home ashamed and pointed as a loser.
The only person that treats him kindly is the sister-in-law, Kasumi Kaho. In the scorching summer of 2015, Masakazu begins to grow a forbidden attraction for Kaho and he finally does the unthinkable, when he jumps on her, uninvited.
She initially didn’t like the idea of that happening but something did grow on her gradually and she ends up loving it.
She is appalled when she learns Masakazu found a new job and he is about to leave. They then, drown themselves in the last night of sweaty sex.