https://sukebei.nyaa.si/view/2475008

Shinya’s school days are boring until Akane, a woman that his brother was to marry due to a family arrangement, started attending the same school that he was attending. Shinya remembers meeting Akane when they were younger and that they made a promise to be together when they were older. In order to make Akane, his and his alone, he gets his sister-in-law to teach him everyway possible to please a woman. After he approaches Akane, and they begin to make love, the gradual distance between the two begins to close and affects everyone around them…