A high school student fascinated by killers. He partners with Yoru to investigate a string of murders involving severed left hands. He eventually traces the crimes to the local cafe owner, confronts him, and deduces that Yoru is actually an imposter named Yu who assumed her deceased twin's identity.
Itsuki treats the victims as clinical subjects in his pursuit of the killer.
Partners in a dark investigation driven by shared morbid curiosity.
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