[@Jay Kalton]
Oh holy crap, I [i]just[/i] remembered that his sister is named Mari too. I was just going off the whole nearly matching personalities and hobbies thing, but that gives it a whole new level! Still, Igarashi Mari is kind of a tired office drone at the moment, so they're relatively different enough for Ren not to make that mistake.

Now, as for the possibility that he might just decide to [i]consciously[/i] make her his unofficial new sister is another matter entirely...