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...

Suspect X

Miki (Kaoru Mitsumune), Aya (Mika Kumagai), Megumi (Miyako Takayama) and Haruka (Yukiyo Sono) are friends in the same photography club at their university. They often spend their time together at "Tide-Pool" tea shop, run by Miki's parents.  One month before they graduate, they girls plan a graduation trip, but Miki is unable to join due to her studies. Also, Haruka lost the girls' trip money. They all make up, but next month they'll go their separate ways. Miki feels empty ...