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A typical residential area in Tokyo, Japan. This was where the incident in question occurred. Two weeks ago, a murder took place here. And it was a bizarre kind of killing. The victim's body was mutilated so brutally that it was hard to believe a human was responsible, and not a single footprint was left in the vicinity. The victim left behind more blood than a human could possibly hold, as if their entire internal organs had been dragged out by a knife, and the body was marked with traces of teeth and claws that didn't seem human. Even the police have been unable to find the true culprit. If the killer were human, could they have really torn someone apart to this extent? And one more thing. The murder weapon was discovered last night. What do you think it was? A kitchen knife, an axe, a dagger, or a sashimi knife? Surprisingly, the weapon was a single student utility knife. A tool no one ever expected to be involved in such a thing. So that implies the culprit is a student... But could a student have committed such a murder alone? Was it really a student? Or was it something else imitating one?