Worst Gaiden Mr. Zetton

Chapter 8: The Lost Boys
Chapter 7: A Silent Voice
Chapter 9: Blackboard Jungle
Chapter 7: A Silent Voice
Chapter 9: Blackboard Jungle
After years of studying, Hanazawa Saburou, AKA Suzuran's legendary Zetton, has finally become a high school teacher. But on his first day at work, the principal tells him he was actually hired not to teach, but to make the students of his homeroom class drop out of school?!