In early 20th century Japan, a detective arrives at a sprawling mansion to investigate a locked-room murder that defies all logic. The victim lies dead in a sealed chamber with no weapon, no signs of struggle, and no apparent way for the killer to have entered or escaped. As he interviews the household members, each with their own secrets and motives, the detective discovers layers of deception woven through decades of family history. What begins as a straightforward murder case transforms into something far more unsettling: a psychological puzzle where reality itself becomes questionable. The film's claustrophobic atmosphere and deliberate pacing build tension through careful observation rather than action, asking whether the truth can ever be known when everyone involved has reason to lie. Based on a classic mystery tale, this short work captures the intricate plotting and psychological depth that defined an era of Japanese detective fiction, where the crime matters less than what it reveals about human nature.