Assassination classroom. Volume 1, Time for assassination / story and art by Yusei Matsui ; translation, Tetsuichiro Miyaki ; English adaptation, Bryant Turnage ; touch-up & lettering, Stephen Dutro.
The students in class 3-E are the misfits in their school, but their teacher is a powerful, tentacled extraterrestrial who has already damaged the Moon and threatens the Earth, and they have been assigned to assassinate him.