Hataraku Maou-sama Finally Reveals Details on Maou's Backstory

The Devil Is a Part-Timer returns with a second season and the devil seems to be in new trouble other than just managing a household.

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The Devil is a Part-Timer! Season 2 Part 2 Discussion - Forums

Source of Info for Hataraku Maou-sama! Novels on Tumblr

Full Name : Sadao Maou Anime : - Anime Encyclopedia

The Devil Is a Part-Timer, Vol. 1 - light novel (The Devil Is a

Hataraku Maou-sama/The Devil is a Part-Timer! Episode 3 and 4

The Devil Is a Part-Timer!, Vol. 1 (light novel) eBook

はたらく魔王さま! 5 [Hataraku Maou-sama! 5] by Satoshi Wagahara

Light Novel Volume 12, Hataraku Maou-sama! Wiki

Mitsuki Sarue, Hataraku Maou-sama! Wiki