Meet class 3-E of Kunugigaoka Middle School where every morning they greet their sensei with a massive firing squad. The sensei is a weird combination of an alien and a octopus that moves at speeds of mach-20. It turns out this creature was responsible for the destruction of the moon, rendering it forever in a crescent shape. He has announced that he will destroy the world in one year. The creature will teach class 3-E how to assassinate him before the year is over.
from Manga Updates
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Notes

Alternative Names: Assassination Classroom
Author: MATSUI Yuusei
Artist: MATSUI Yuusei
Genre: Action, Comedy, School Life, Slice of Life, Supernatural
Demographic: Shounen
Adaptedc into the anime, Ansatsu Kyoushitsu.