The Unkillable Ones' Protege -{Assassination Classroom}-

It has been seven years. Seven years since Class 3-E has graduated. And Nagisa Shiota is a trainee teacher, following in the footsteps of Korosensei. But this introductory year to education took an unexpected turn on his first day and Nagisa finds himself suddenly struggling with deadly surprises, old friends and his students' terrible grades.
And a threat begins to loom over him, making Nagisa have to wonder: will this be his final graduation?

WARNING: There are spoilers for the anime! Also, this doesn't follow any canon time skip plotline seen outside the final season. You have been warned!