For a long time now... I've had feelings for you, sister-in-law," Akira had a faint crush on his brother's wife, Kaori. He once gave up on this love. However, when his brother's infidelity was revealed, putting his brother's marriage at risk of divorce, Akira began to make a move to claim Kaori for himself. On the other hand, Kaori couldn't hide her agitation at the unexpected confession. Torn between her husband and Akira, her emotions wavered. Gradually, she started to be swayed by the powerful pleasure of sex that she couldn't experience with her husband.