電撃小説大賞
"The Devil Is a Part-Timer!" began as a light novel series written by Satoshi Wagahara, with illustrations by the artist 029 (Oniku). Wagahara originally entered the first novel in the series, originally titled , into ASCII Media Works' 17th Dengeki Novel Prize in 2010 and the novel won the Silver Prize. The first novel was published by ASCII Media Works on February 10, 2011, under their Dengeki Bunko imprint, with 21 main novels, two prequel novels, one spin-off novel, and three bonus novels being released by the series' conclusion. The final novel was initially scheduled to be published on July 10, 2020 but was delayed to August 7, 2020 as a result of the effects caused by COVID-19.