In each level, he will try a lot of method to find the truant and preach him after he found the truant. In the ending, the serious student find the reason his classmate play truant (Not gonna tell ya what) and help him with his reason while the truant study beside him. (the truant reason for playing truant is hinted in some level.
Apparently they become good friends~
What I like about this game is the existence of logic that is within this world, unlike other similar type where you can grab someting out of TV xD. The ads is also lesser than the other and the puzzle is pretty challenging.
This game also have some level that take the concept "Sometimes not doing anything is the right thing." So you need patience to clear these level.
It's fun to collect bad ending tho.