Yayoi raises her only son, Kouta, while secretly working part-time at a love hotel. She always lives a quiet life and has never told her son about her side job. But one day, a friend tells Kouta, "Someone said they saw a hotel worker who looks just like your mom." This makes Kouta begin to suspect the truth. Unsure whether to believe it, he sneaks into Yayoi's bedroom while she sleeps to investigate. Focusing on the detail mentioned by his friend—"three moles on her labia"—he confirms her true identity. In that instant, a powerful shock runs through his body.