A short 10 minute film by the non-existant "Houchiku Movie Corporation" 
After destroying the dark castles and finally defeating the enemy, Scarlett leaves the group to continue on. While Koto and her friends are together, she meet up again with Scarlett expectantly. A new, powerful enemy is back and must be defeated at all costs, he is more powerful than all of the others... but it will take all of their powers to combine and work together as one...

DVD specials. 

Episode 2.5: Defeat of Red / The Hot Spring in Paradise 
Episode 3.5: Horrible Green / Violet Has Slept 
Episode 4.5: Movie Trap / Dream Carnival

Koto unknowingly seals away the Sun Goddess Amaterasu, and now she is in a different world and can't return. Meeting priestesses who combat the evil in this strange place she learns that Black Towers throughout the land keep Amatersu sealed away and are guarded by evil monsters. Koto must now find a way to help defeat these monsters and return the world to the way it was.
 
(Source: Anime News Network)

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