[Uh oh. He must've revealed too much... Though he wanted to avert the topic with a joke or say something stupid.

But there was no way that he could do that now. There's a sigh as Hiro turns to her with a sadden expression.]

Well, the truth is... I had to give up something in exchange for becoming human again. It's a temporary method that I wanted to try out on myself.

[And perhaps punish himself for taking away his friend's precious memories whenever he started the third world.]

So... I really don't know who you are. In exchange for this, I lost my memories of you.