[Kamui4356]

I say they're both male.

Spoiler for reasoning:

They seem to be a few years older than Aruruu, yet both have completely flat chests. If they were female, I'd think they'd have at least some development in that area. While they do behave rather effeminate, I've seen enough anime to know better than to conclude that means they are in fact female. They're probably just confused. I blame Oboro.