I'm Yuta. Three years into my marriage, our long-awaited child was born. After the baby came, my wife's bad moods increased, and I couldn't find any joy in my current life. Then one day, I reunited with my wife's mother, Koharu. The truth is, Koharu and I have a complicated history, and now my wife and Koharu are estranged. Our reunion after six years brought back old memories. Those days when we desired each other. A mother's feelings for her daughter. My own inner conflict over my wife and child. When these emotions all tangled together, we made up our minds. A "friends with benefits" relationship with my wife's mother. Driven by the pleasure of her flesh folds after six years, I found myself desperately seeking Koharu.