Jigoku Sensei Nube: Gozen 0 Ji Nube Shisu! 6.74
Other Name: Hell Teacher Nube: 0 a.m. Nube Dead, 地獄先生ぬ～べ～ 午前0時ぬ～べ～死す！！
Summary: New student comes to Nube class. His name is Jun and he's a lonely boy who loves clowns very much. His only friend is a Pierre - clown in the mirror. And one night Pierre gives Jun a mask with strange abilities. At that point Jun starts to act strange and lot of accidents occur in the school.