Innocent Key - The Homework Never Ends

Today we have this lovely video featuring Chirno, Rumia, Sakuya and many other miscelaneous!
Just for the record, these videos are all abridged versions of the original songs and this version in particular is much much better in the original version. You can ejoy said version here:
http://www.youtube.com/watch?v=jx9I2-IbgDk