“Shun” falls in love at first sight with her, who boasts a perfect figure that makes it hard to believe she's his friend's mom. Despite having a girlfriend, he becomes completely obsessed with his friend's mom and ends up spending the night with her. Just then, his friend returns home and witnesses their passionate encounter. Fueled by a desire for revenge, he goes in search of “Shun's” girlfriend. Me, my girlfriend, my best friend, and even my friend's mom! This precarious and steamy four-way relationship heads straight for disaster.