TALK TO AMASAWA AT THE MRC
Go to the MRC and start the conversation.
Ask her about the Issue with Ebisu-sensei and about the Villain wrestler.
Talk to Ebisu-sensei in the Faculty Room
The Faculty Room is on the 2nd floor.
After talking to Ebisu-sensei, find the trap. Enter Observation Mode and look at the door. There is a chalkboard eraser...
Find the other two traps at the chair.
Examine the cussion and the floor.
Chase him to the bathroom.
Find the two traps.
Another chalk eraser and look at the toilet signs.
First, "Teach the Punks a Lesson", then "Subdue Ebisu-sensei".