I had a hard time deciding whether to separate these cels into two categories or to just group them together. As you can see, I ended up grouping them. The reason I considered separating them is that the artwork changes after episode four. Some of the character design changes are quite drastic. I am told that the reason this happened was that this anime, which originated as a video game, was going to be a four part OVA. After the first four episodes were created, the plan was changed. Eight more episodes were then added on to create a twelve episode TV show.