Season 1
A class of junior high "misfit" students who are tasked with assassinating their new teacher, an octopus-like creature nicknamed Koro-sensei, who destroyed the moon and threatens to destroy Earth in a year. The students have to learn to balance their assassination attempts with the lessons from Koro-sensei, who is surprisingly an excellent teacher, while the government offers a ¥10 billion reward for his head. Each episode often focuses on individual students, their growth, and their internal conflicts between wanting to kill their teacher and growing to care for him.
Episodes
1 Assassination Time Jan 10, 2015 
2 Baseball Time Jan 17, 2015 
3 Karma Time Jan 31, 2015 
4 Grown-Up Time Feb 7, 2015 
5 Assembly Time Feb 14, 2015 
6 Test Time Feb 21, 2015 
7 School Trip Time, First Period Feb 28, 2015 
8 School Trip Time, Second Period Mar 7, 2015 
9 Transfer Student Time Mar 14, 2015 
10 L and R Time Mar 21, 2015 
11 Transfer Student Time, Second Period Mar 28, 2015 
12 Ball Game Tournament Time Apr 11, 2015 
13 Talent Time Apr 18, 2015 
14 Vision Time Apr 25, 2015 
15 End-of-Term Time May 2, 2015 
16 School's Out - First Term May 9, 2015 
17 Island Time May 16, 2015 
18 Action Time May 23, 2015 
19 Pandemonium Time May 30, 2015 
20 Karma Time, Second Period Jun 6, 2015 
21 XX Time Jun 13, 2015 
22 Nagisa Time Jun 20, 2015