JIGOKU SENSEI NUBE

Nube is a clumsy, easygoing, and very kind teacher, but he has a secret under his glove on the left hand. He has a monster hand, and he also has the ability to sense ghosts and evil spirits. So he protects his dear students from these evil spirits with his monster hand, proving to be very powerful. (Source: Anime News Network) — Description from AniList community (anilist.co).