Tomotaka Tsukishima lived quietly with Mika, a housemate with a complicated past. Good and peaceful days- however one day, they are abducted by a mysterious group. They inform. "You are the 'past' of a 'future' criminal, and we do not forgive. So, 'I kidnapped you in the past.'" The sin of "future" falls on the self from the "past" !? SF Crime Suspense begins!