Keita, a young man who was fired from his company and kicked out of his house, ends up staying with his older brother and his wife until he finds a new job. However, he has no place in their house and is constantly being scolded by his brother, who says, "You're a pathetic man, still a virgin at 30." Wanting to gain some confidence, Keita makes a lifelong wish to his brother's wife, Riho, to take his virginity. Riho, feeling sorry for Keita, allows her body to touch him for a little while, but the moment he penetrates her, she is hit with a tingling pleasure...