Newlyweds Nana and Shota move into an apartment building whose residents play a game declaring who they'd like to kill. Then, the murders start.

A male corpse is discovered with a smashed face and burned hands. Strangely, the cause of death is determined to be strangulation. When Detective Kaoru Utsumi attempts to corroborate the victim’s ex-wife’s alibi she discovers the mysterious neighbor and only a few small clues to help her disprove a seemingly "airtight" alibi...