A few months ago an alien destroyed 75% of the moon

and he plans to do that to Earth if he’s not killed in a year

so you have until graduation…

your class is hired to kill him and he is your teacher, kill him and win 10 million yen and save your world!

But he’s also teaching you math and his super powered so…he basically won’t die

guns didn’t work, bombs, knives…

you have weapons that won’t harm humans and only him luckily

“Now then everyone complete the equation (X+8) (X-2)!”

you can’t kill him while the lessons on but other than that? Go mental