Assassination Classroom
A manga about a class of reject middle schoolers who are tasked to assassinate their alien like teacher before he blows up the Earth in 1 year.
Reread this today and it’s still so very good. Yusei Matsui over-the-top facial expressions shine through along with the excellent design of Koro Sensei. It’s such a bizarre concept for a series but it works perfectly as a shonen manga.
It’s available from VIZ along with a great anime adaptation.
~dakazu