Kaiba is one of the detectives investigating Aki's suicide, along with Mochizuki. Three years prior, his younger sister Fumiko committed suicide in a similar way to Aki, and the trauma from this event causes him to take particular interest in Aki's case.
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Kaiba is one of the detectives investigating Aki's suicide, along with Mochizuki. Three years prior, his younger sister Fumiko committed suicide in a similar way to Aki, and the trauma from this event causes him to take particular interest in Aki's case.
