Assassination classroom: The Educational Assassin.

Being a teacher, that's all Clay wanted, to teach the next generation to lead the world into a bright future....unfortunately he picked the wrong school to work at, kunugigaoka junior high school, where if you screwed up too bad, it's off to e class with you, and that's unfortunately where Clay found himself after defending an E class student from bulllying, and as if things couldn't have gotten weirder.....most of the moon explodes, next thing Clay knows, he's the assistant to a new class e teacher, a yellow octopus man who plans to destory the earth in one year, class E's goal, kill him and gain 10 billion yen, and with such a prize and the earth on the line, Clay must help the octopus, also known as Koro sensei train the students to become not only good students, but full fledged assassin's, so let's just say, this may be clays most interesting (possibly last) year of teaching yet.