Hitozuma no toriko: Tonari no Asami-san.

A couple with a large age gap moves into the house next door to Yuzu and Minato, a brother and sister. Minato falls in love at first sight with Asami, the wife, who comes to greet him after moving in, and begins to spy on Asami's behavior. Gradually, Yuzu also begins to be attracted to Asami...