ASSASSINATION CLASSROOM (English Comics) Vol 1-21 END

When a tentacled creature destroys 70% of the moon and threatens to do the same to Earth, Class 3-E of Kunugigaoka Junior High is handed an impossible mission: assassinate their homeroom teacher before graduation. Their target moves at Mach 20, regenerates instantly, and is immune to conventional weapons — yet he is also, somehow, the most dedicated teacher they have ever had.

Equal parts action, comedy, and surprisingly heartfelt coming-of-age story, Assassination Classroom follows a group of misfits training to be killers while learning life lessons from the very creature they are meant to destroy. The closer they get to the deadline, the more they realise the real question is not whether they can kill him — but whether they want to.

A complete 21-volume series. One of the most beloved manga of its generation.