Yukkiina! is a Christmas album released on November 27, 2010 by Numtack05 to showcase a small collection of songs. It contains a remixed version of the Part 3 song Assassin! and a karaoke version of the remix. The album also includes two new bonus songs not uploaded for public viewing, making four tracks in all.
- The cover illustration shows Kagamine Rin in her cat costume from Assassin!