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)

The series follows Meisuke Nueno, better known as Nube, an exorcist who also happens to be the teacher for a 5th grade class at Doumori Elementary. While he uses many various exorcism techniques, his main weapon is the Demon Hand which is the power of a chaotic oni sealed right where his left hand should be. The series follows Nube and Doumori class 5-3 though the many weird, chaotic, and downright silly and insane encounters they face with the many forms and elements of the supernatural.
 (Source: Wikipedia) 
Included one-shots: 
Volume 1: Jigoku Sensei Nubo (2nd pilot) 
Volume 2: Jigoku Sensei Nubo (1st pilot)

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