>>131724No Flandre didn't leave the basement, because she was locked.
She has autism like the other little sister character.
Every time she got out of her room Sakuya or Remillia gave her a new toy and said to her that she should stay a little longer in her room and play with it.
They did it for 495 and during this time Sakuya develop this smug face.
Cirno has just ADHD like every fairy character in all fiction ever.
