Himeko, who woke up in an unfamiliar house, met a boy in a similar situation, Koichi, and decided to seek out the criminals who locked her in here. However, what awaited such two people was the atrocious trap set by the lord of the hall. Koichi scolds and crawls on Himeko who is about to be attacked by a nanimono, and will bear the bruise of death. "The boy's life is three hours later .... If you want to live and get out of here, look for the three hidden keys in this hall. ”Himeko believes in information that can be said to be the only clue, and starts searching the inside of the hall where nanimonos crawl. Is it salvation to be waiting for her? Or ...