Welcome to Demon-School, Iruma-kun

Part A: A new teacher named Balse Robin, who is quite innocent and fearful of nothing, arrives! His first lesson involves interacting with familiars. Iruma turns pale at the thought of this lesson since his familiar happens to be Kalego, but... Part B: Iruma decides his next goal now that he’s moved up a rank. Apparently, there are groups at Babyls where like-minded demons gather called Battlers. Iruma shows some interest in Battlers, but then is greeted by a terrifying sound...