Now if you were thinking "her mommy's tummy", you'd be anatomically incorrect, since the womb and stomach are two completely different organs. And if you were thinking "when her parents decided to procreate", you're thinking too hard.

Of course, this is ancient news for those who know, including me. ^^" Recently found that video though.

She came from a game, Triangle Hearts. That video should be from the fanbox, Lyrical Toybox. ^^" As you can see, that's quite a difference when you compare it to what happened when she got her own mahou shoujo series.