Tale of the Nine Tailed: An Unfinished Story

Even if you're not a fan of the show's actors, you've got to respect this idea of maximising on a storyline. The interaction between a main and supporting character of the original show was really endearing, and while it wasn't technically part of the main story, it helped to add an element of interest to a (not-very-nice) main character.

I like this method of expanding the background story and providing a better understanding of a character's behavior and the reasoning behind their actions.

I actually found this mini-series by accident, as it wasn't marketed along with the main show. The good thing about that was it felt more like a nice treat/gift received while waiting for the second series of the main show to start.

Highly recommended.