Tanaka has been single his entire life when he is invited to his best friend's house. His friend is delayed at work, leaving Tanaka alone over dinner with the unbelievably cute Keiko. He knows he should never touch his best friend's girlfriend, but the rare chance overwhelms him and he pushes her down. To his surprise, she does not resist and tells him to follow his instincts. Tanaka tries every trick he has learned from porn, making Keiko moan, cum and squirt. Excited by stealing his friend's girlfriend, he pounds her slender, dripping pussy in multiple positions and finally loses control inside her. Guilt crashes over him afterward, but the thrill of NTR is even stronger—marking the beginning of his girlfriend-stealing story.