The only reason these students are in this school in the first place is because they are all idiots. As for our MC, he's an idiot and a simp.
MC's ability can instantly kill or maim someone. He can cook a person's brain or cause frostbite on a person's limb.
The crazy, narcissistic girl that attacked the MC here can probably pull off shit like Byakuya from Bleach with a cloud of sakura-petal-shaped razor blades.
Hell, even bean boi can restrain someone with sprouts, pop a bean into their mouth or another orifice and watch as the sprout tears it's way through the person.