(Hinamatsuri spoilers up to ch 76, but I don’t expect the anime to even reach this character’s introduction)

Haru has given us two motives to explain his presence, and they’re very much at odds with each other. Recall his explanation in ch 68

and compare that to the heel turn in ch 76

Rocksion is undeniably at the center of events, but Haru’s involvement is an unknown. Also notice in ch 76 how he casually passed over his own origin, neglecting to include it in the presentation.

He can’t perform and prevent Rocksion at the same time. At least one of his statements is a blatant lie.

The theory I’m running with is that Haru wants to keep the bestgirls out of Rocksion so he can seize it for himself. He’s going to team up with Atsushi behind their backs. And I think we all know where that will lead.

A Battle of the Bands Arc.