Special episode of Obey Me! released as a lead-up to the anime announcement of the ONA series.

Lucifer, Satan, and the other five princes of hell are students at the Royal Academy of Diavolo, where they train to rule the Demon World. From following humans to falling in love, their individual quirks land them in interesting situations every single day! Will their antics get them expelled, or will one of these infamous brothers come out on top? 
 
(Source: Funimation) 
 
Note: Episode 7 is an Audio Commentary by the VAs, and has an extended runtime of ~35 minutes as opposed to the standard 5 minute long episode.

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