Hell Teacher Nube

Nube Is Dead?! The Strongest Rival, Fox Demon Tamamo (1x6)

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A Kitsune, Yoko Tamamo, tries to kill Hiroshi to get his skull and become human. On Nube's attempt to save Hiroshi, Nube ended topless in a blood bath after he falls in a dark warehouse and his torso, arms, and back are slashed by 4 claws.