After being fired from his job and kicked out of his home, the young man, Masaya, had to stay with his older brother and his wife, Mayuka, until he found a new job. However, he had no place of his own in their home and was constantly berated by his brother for still being a virgin at 30. Desperate to regain his confidence, Masaya asked Mayuka, his brother's wife, to take his virginity, making it his lifelong wish. Moved by Masaya's plight, Mayuka agreed to let him have his way, just a little. But the moment he inserted himself, she was overwhelmed by a tingling sensation unlike anything she'd ever experienced before...