@Gokucrash990 "egg" is a bit of trans culture slang for... well, a transgendered person who doesn't yet realize they are trans. Still in the closet even to themselves. I was mostly being facetious, I know that's
probably not the author's intent. But it would be interesting if that were the reason Kakeru could become a magical girl despite seemingly being a boy on the surface. Since, yeah, that's supposed to be impossible in this universe.
(certain chapters like 6.5 do at least support the idea Kakeru is really into this whole thing when they think no one is looking)