The story revolves around a devoted mother taking care of her 35-year-old son, a man known as the "man-child" because he has not left his cluttered room on the second floor for the past 20 years. The son refuses to engage with the outside world, imprisoning himself in a space filled with filth and devoid of any hope for the future.

With boundless love, the mother provides food, water, and clean clothes for her son daily, but everything changes when one day she tries to tidy up the room. The mother-son relationship transcends normal boundaries, and now they only feel closest when physically intimate. The affection becomes distorted, evolving into a strange dependency that neither can escape.

Today, like any other day, the mother prepares to clean her son's room on the second floor. For her, it is not just a daily task but also a way to maintain the peculiar connection between the two – a relationship warped by circumstances and unhealthy emotions.

Diễn viên: Yu Kawakami (Shizuku Morino)