What is up with the thing on the bottom...

That littl' dating sim-ish thing...
It's Ar Tonelico! XD

Do not question it.
MEYOOSIK! Huzzah! *dances*
...No offense...but I'm not that otaku/nerdy enough to know what that is...
Hoo boy. Umm... for answers, follow this link. Then read, like, the bottom half of the thread, from Kazuhiro's post forward. That should explain why it's here at any rate.
...
Who the hell linked that?
I want to give him/her 100 WOWNESS.