[Witched]

Spoiler for !:

Now that I think of it, since when did Nico wink and smile like that?

I guess the 'spare' mentioned in Chapter 9 meant that Juubey thought that the real Nico was the duplicate..

That pretty much explains how she knew about Satomi's doings in Chapter 14..

O-O That probably explains Walpurgisnacht..