Hell Teacher: Jigoku Sensei Nube

The Human Faced Tumor (1x13)

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Nube is not showing up for school, and there are rumors about a mysterious person living in the old school building. Hiroshi and his friends sneak into the building to investigate, only to find Nube possessed by a demon and unable to use his Demon Hand. Now his students must muster all their courage to save their teacher.