Am I Actually the Strongest? Manga, Vol. 5

It took no time at all for a weird professor to get attached to Haruto just after he started school. But to make matters worse, when he accidentally insults a flashy upperclassman on the day of the entrance ceremonies, he gets dragged into disastrous trouble along with a girl who's a bit slow on the uptake. All Haruto and his copy wants is a peaceful, quiet school life, but what fate awaits them?!