Erm... Where is Nano's winding key?

LucasHidemiKomori said:
Erm... Where is Nano's winding key?

Personally, I assume she removed it when she went evil.

EDIT: Translated the artist's commentary, and this is confirmed. Well... kinda more like the removal turned her evil, not vice versa.

"In the classroom
Yuuko: 'If the screw in Nano-chan's back were removed, her real self would show itself! For instance, she could, say, conquer the world!'
Mio-chan: 'ARE YOU STUPID?!'"

Someone, probably either the Professor or Kana, removed her restraining bolt (wind-up key at the back) and re-programmed her into a battle-gynoid.