Haru
A college student who Haru encounters on a train. He's best known for orchestrating a hostage situation aboard the train—holding passengers captive as part of an elaborate scheme to fund his younger sister's medical surgery overseas. His plan hinged on monetizing the incident through a video ad campaign, hoping the views and revenue would cover the expensive American procedure she needed.
It's a pretty dark motivation behind what could've been a tragedy, though it speaks to how far he was willing to go for family. Whether he actually believed this would work or was simply desperate is left somewhat ambiguous, which makes the character more compelling than a straightforward villain.
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