It's kinda refreshing that Asura isn't some sort of schemer, he's a zealot who genuinely believes in what he's doing and doesn't see it as something to hide.
Anyone worried that his sister was gonna get damseled to extend the arc can rest easy. If you've read Iruma you could probably guess it was gonna be an opportunity for character development.
As soon as this manga tried to have every girl in every chapter it was doomed. It would've done much better if it was closer to MarriageXToxin where each girl gets a big mystery arc before going away for awhile. Would also help if there was some sort of end goal.
If you like the running gag you'll probably like the spin off since it's probably gonna be that 90% of the time. The title is "My Teen Romcom won't start!" after all