My wife's friend suddenly wants to be raw, Sumire Mihara

The movie revolves around the complex and intimate relationship between a son, Kenichi, and his mother, as they spend time together at a hot spring resort. As they engage in conversations and activities, it becomes clear that Kenichi has developed romantic feelings for his mother. The story explores the blurred lines between familial love and desire, creating a sense of tension and unease. The title 'My wife's friend suddenly wants to be raw' suggests a sudden and unexpected shift in dynamics, which is reflected in Kenichi's confession to his mother.