Following a catastrophic event, Future Foundation emerges to safeguard the world, alongside the Special Crime Investigations unit tasked with probing macabre murders. Misaki Asano, a cheerful recruit averse to gore, joins forces with the unkempt Takumi Hijirihara to shed light in a bleak reality. Their initial assignment involves unraveling a series of killings at an idol's concert, swiftly resolved by Hijirihara. However, the true culprit is found dismembered by the elusive 'Killer Killer,' a vigilante leaving whimsical notes at the crime scene. As the hunt intensifies, the team realizes the enigmatic Killer Killer may have ties closer than anticipated, plunging them into a web of darkness and deceit.