The Seed Destiny TV series may have ended the battle, but the staff felt that it did not provide enough closure for the story and characters. So, we have the Final Plus (F+... hmm...) OVA; the final battle plays out nearly identical to the TV series. The action is extended and given extra shininess, and some additional exposition is added while the battle rages. The additions enhance the battle, but the bulk of it is just re-watching episode fifty. (thetvdb.com)