Hell Teacher Nube OVA(地獄先生ぬ～べ～)

Hell Teacher Nube is back and his precious students are still in danger of being hurt by demons, ghosts and the mysterious 'Man in the wall'. Luckily Nube is not alone in his struggles. The somewhat daft but beautiful Yukime and the yokai playboy turned doctor Tamamo-sensei joins forces to help save the students.