Another World is a devilish drug that, once used, increases pleasure limitlessly and mutates people into monsters with no sense of self or reason. Within the Narcotics Control Division, there's a group with abilities that specialize in investigating AW called the “Unconstrained Shadow Soldiers”, commonly known as “Matori Play”.

With his bare hands, high schooler Kongou Rikito stops a car being recklessly driven by an AW user. Lucy, a Narcotics Control officer, notices his strength and makes Rikito a member of Matori Play to cooperate with the AW investigation, but…!?