I have an idea.
We could solve the issue right here.
I just need my Interdimensional Toyota(TM) Truck
I'll start with running the brat over with my truck. Don't worry if he is just in the shower, by patented Interdimensional Toyota(TM) 8-wheeler would just crash through the wall of the 3-story building and run him over....
Don't worry if the trucks aren't a thing in your setting, that's why it's Interdimensional.
The MC would be stricken by this sudden attack, and would want to do something about this injustice, alas, the Interdimensional disappears into the void before he could intervene.
But there is this document about dropping from the school. Don't worry, my Interdimensional Toyota(TM) 8-wheeler is fully operational again and would crash through the walls of the principal office, running him over. Then my beautiful cat-girl assistant will steal the note.
The MC would give a chase, and then I run him over with the truck. (Crushing through walls doesn't always work on protagonists, that's why I have my cat-girl assistant, after all, to lure people in)
Of course, the MC survives the collision with my truck, that's why he is MC. He is immune to death by the truck since this works only in episode 1.
Then, as he recovers, me and my catgirl assistant keep the road rage across the campus, and then, in the end, the fully recovered MC would have no choice than to continue studies to honour the fallen and eventually find the way to catch the famous duo of Little Girl & Truck.