When Mr. Saitou is later found stabbed , suspicion immediately falls on Miyabi .
Miyabi confronts Noboru Saitou , the class 's former teacher , about the incident that drove them to hate teachers .
When teacher teacher is later found stabbed , suspicion immediately falls on Miyabi .
Miyabi confronts Noboru Saitou , the class 's former teacher , about the incident that drove them to hate teachers .