Shinya's school days are dull until Akane, a woman his brother was set to marry through a family arrangement, begins attending the same school. Shinya recalls meeting Akane in their youth and the promise they made to be together when they grew up. To make Akane his and his alone, he has his sister-in-law teach him every possible way to please a woman. After he approaches Akane and they begin to make love, the growing closeness between them starts to affect everyone around them...