I'll believe my own students - S1.E10

Everyone is lovelorn that day. 3-D went to a group date wearing formal clothes to keep the fact that they are from Shirokin but soon was revealed. Yankumi saw her long time crush with a girl, and Tetsu the guy who has a crush on Yankumi forever felt that she'll never get Yankumi. But that wasn't the problem, one night, a boy fleeing from a video store he shoplifted from was bumped by the 3-D and were accused of steeling. How can Yankumi prevent them from being expelled?