"The Devil Is a Part-Timer! Official Anthology Comic" is a spin-off manga collection that expands on the world and characters of the original light novel and anime series. The anthology features a series of short, self-contained stories created by various artists, offering humorous and lighthearted takes on the main series' premise and characters. The narrative revolves around the daily lives of the central figures, blending slice-of-life comedy with the fantastical elements of the original story.

The protagonist, Sadao Maou, is the former Demon King who, after being defeated in his conquest of the human world, finds himself stranded in modern-day Tokyo. Forced to adapt to human society, he takes on a part-time job at a fast-food restaurant, MgRonald, while attempting to regain his powers. His former general, Shiro Ashiya, lives with him as a housemate, managing their finances and household chores. The two navigate mundane human life while occasionally encountering remnants of their past in Ente Isla, the fantasy world they once ruled.

Emi Yusa, a hero from Ente Isla who initially sought to defeat Maou, also resides in Tokyo, working as a call center operator. Despite her lingering animosity toward Maou, she becomes entangled in his daily struggles, often finding herself reluctantly assisting him. The anthology explores the dynamic between these characters, highlighting their comedic interactions and the absurdity of their situation. Other recurring characters include Chiho Sasaki, a high school student and Maou's coworker, who harbors feelings for him, and Suzuno Kamazuki, a cleric from Ente Isla who initially poses as a rival but gradually integrates into their group.

The stories in the anthology often focus on the characters' attempts to balance their extraordinary backgrounds with ordinary human experiences. Themes of identity, adaptation, and camaraderie are explored through humorous scenarios, such as Maou and Ashiya struggling with budgeting, Emi dealing with workplace challenges, or the group engaging in mundane activities like shopping or celebrating holidays. The anthology maintains the lighthearted tone of the original series while offering fresh perspectives and comedic situations that deepen the reader's understanding of the characters and their relationships.