Mother Rui raised her only son Kouta through tough financial times, but to earn money for his exam fees, she begins working part-time in the nightlife industry. One day, promised a large sum by a customer, she finally succumbs to the temptation. By chance, Kouta witnesses the act and is filled with intense anger and disappointment toward his mother. He begins to despise Rui, and the twisted emotions he has secretly harbored start to grow stronger. This incident completely changes the relationship between mother and son.