Welcome to Demon School! Iruma-kun (2019)

S4E23 The Road to the Demon King

Iruma heads over to see Sabro, hoping to dig up some information about the Demon Kings. He figures Sabro might know a thing or two, given his family background and obsession with that sort of thing. Sure enough, once he brings it up, Sabro's whole face lights up. The guy launches straight into a passionate explanation, barely pausing for breath, while Iruma just stands there trying to keep up. It's a lot to take in, but at least he's finally getting somewhere with his research.