The second season of Obey Me! 

The seven princes are back for more shenanigans at the Royal Academy of Diavolo. Whether they’re failing their tests from missing MC so much, getting lost at sea, or taking a demonic baseball game too seriously, these boys just can’t keep it together! 
(Source: Crunchyroll)

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.

NTT Solmare