Mr. and Mrs. Matsumoto have returned to their husband's parents' home. Her wife May had her doubts from the beginning of their marriage. It was the presence of her brother-in-law Naoki. It is said that he has been living a shut-in life in a room on the second floor for four years. Driven by her anxiety, Mei couldn't sleep until midnight, and when she went to the kitchen alone to drink water, something strange happened...
