Summer is indeed the most memorable time in the life of the older brother and his sister-in-law Mizuno, as it marks a pivotal moment that completely changes their relationship.
That summer, due to the relocation of the company right near his younger brother's house, the older brother asked to stay at his brother's place for a while to settle down and for convenience in commuting. It was here that he inadvertently fell for his sister-in-law because she was not only beautiful and skilled in household duties but also very understanding of men's psychology.
Although he knew she was his brother's wife, he always tried to encourage himself to set aside those thoughts, but she increasingly appeared sensual and stimulating in front of him by wearing very provocative outfits, and sometimes even not wearing a bra. This made him unable to control himself and he went too far with her on the day when his younger brother was not home.
Although he was the one who acted wrongly first, he knew that his sister-in-law had secretly loved him for a long time; her love had been given to him since he moved here. Since then, not wanting to make his younger brother sad and disappointed, the two decided to keep this secret, burying the illicit affairs they had caused in their memories.
