Ansatsu KyoushitsuSeries

When a mysterious creature chops the moon down to a permanent crescent, the students of class 3-E of Kunugigaoka Middle School find themselves confronted with an enormous task: assassinate the creature responsible for the disaster before Earth suffers a similar fate. However, the monster, dubbed Koro-sensei (the indestructible teacher), is able to fly at speeds of up to Mach 20, which he demonstrates freely, leaving any attempt to subdue him in his extraterrestrial dust. Furthermore, the misfits of 3-E soon find that the strange, tentacled beast is more than just indomitable—he is the best teacher they have ever had! Adapted from the humorous hit manga by Yuusei Matsui, Ansatsu Kyoushitsu tells the story of these junior high pupils as they polish their assassination skills and grow in order to stand strong against the oppressive school system, their own life problems, and one day, Koro-sensei. [Written by MAL Rewrite]

دانش آموزان کلاس 3-E یک مامورت دارن،اون هم کشتن معلمشون قبل از فارغ و تحصیلی هست،اون معلم ماه رو نابود کرده و قسم خورده تا پایان سال زمین رو هم نابود می‌کنه اگه کشته نشه، اما اعضای این کلاس چجوری می‌تونن همچین هیولایی رو بکشن که حتی قادره سرعتش رو به 20 برابر سرعت صوت برسونه، کسی که ممکنه بهترین معلمی باشه که تا حالا داشتن؟