Koro Sensei Quest!
Season 1, Episode 11: It's Not a Job, It's a Calling
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When Koro-sensei was a human, he was thought of as a hero, but became bored of his work. He was assigned by Aguri Yukimura to be a Demon King and live in a castle, since his predecessor (actually Neuro from Neuro: Supernatural Detective) retired from his position.
All Episodes - Season 1
Episode 1
The E Class and the Big Bad
Episode 2
The Red Devil
Episode 3
The Seductive Witch
Episode 4
The Ruins of Tribulation
Episode 5
The Evolved Mage
Episode 6
The Silver Berserker
Episode 7
The Big Five Attack!
Episode 8
Big Bad Switcheroo
Episode 9
Showdown at Fukuma Tower
Episode 10
Takebayashi, Leaving the E Class?
Episode 11
It's Not a Job, It's a Calling
Episode 12
Bye Bye, Big Bad