[ Well, that's... partially the response he was expecting but not quite what he thought he might get either. He regards Hiyori for a long moment, his own brow furrowing as he tries to sort through the response he's just gotten and then bursts out laughing. ]

That's your concern?

[ He puts his chin in his hand with a sigh and waves his hand. ]

No. It's my real name, but no one has used my real name in so long that it might as well be mine. I was also called Five.

[ He's curious if Hiyori will pick up the implication. ]