Keita lives away from home, living independently. One day, he receives a phone call from his mother, Yukine, for the first time in a while. She says, "Your father will be away on a business trip tomorrow. Why don't you come over and visit?" Hearing those words, Keita immediately understands his mother's true intentions—he realizes she deeply desires him. When Keita returns home after several years, he and Yukine passionately embrace the moment he steps through the door. Their long-awaited sex drives Yukine to climax again and again. But their passion doesn't end there—new emotions begin to grow, deepening their forbidden relationship even further.