Himari moves into the new father's mansion after her mother remarries, but she feels uneasy. One day, her mother is away on a business trip for about two days, so she decides to go to her boyfriend's place. Her stepfather also readily agreed to this, but in the end, she misses her boyfriend and Himari comes home late at night. She starts drinking with her stepfather to relieve stress, but suddenly feels sleepy and loses consciousness. And when she wakes up next time, Himari's limbs were tied to the bed…