Acquainted through work, the Hirose couple are in their third year of marriage. The husband, Yuugo, has a decent income, and they live a smooth life.... But recently, no matter how much Yuugo tries to initiate nighttime activities, Riona always finds an excuse to refuse. Starting to sense discord, Yuugo, feeling apologetic, ends up hiring a detective agency to investigate Riona's daily routine. A few days later, the memory card received from the detective contains footage of Riona in compromising positions being trained by her lover...
