Hokuto: Some Murderer's Conversion

Episode 4 (1x4)

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After the death of his foster mother Ayako, who first showed him unconditional love, Hokuto lives without tears, driven by one goal: to kill Ikuta, the conman who scammed them with fake cancer cures. Filled with anger and hatred, Hokuto plans his revenge and heads to the Ikuta Hadou Research Institute.