Oh that's right, Koakuma was supposed to help with the library. But she was enjoying being a bully too much.

Well, in her defense, it was all cleaned up before Patchy started freaking out about her book. But then, she was the one who hid said book, so...

That's right, ojousama! Put that tiny demon to work.

Not entirely sure why, but I'm reminded of Peanuts. How Marcie hounds Peppermint Patty to do a book report, and in the end completely forgets to do her own one...

Wait, that's barely similar at all.

Zaku_Zelo said:
Well, in her defense, it was all cleaned up before Patchy started freaking out about her book. But then, she was the one who hid said book, so...

She HAS no defense here, she never cleaned it up at all in the first place.