Good animation, disapointing ending
First, some positives. Your animation is beautiful, the music is awesome (I love the flashbacks to previous soundtracks), and the story seems sound. However, it feels like you rushed the ending. It was very abrupt, and we didn't really get a sense of what happened after. Perhaps this will all be revealed in MC 7.5, but if this is the end, what happens at the end of the series, then that was very disappointing indeed. I would like to know what happens after. Where do they go? Do they meet up with the mysterious individuals in the tent in MC 5.5? Does the Auditor live? What happens? Unless you are planning on an 11th installment (though it would be the 14th after 7.5 is released), I believe that some explanation should be given as to what exactly happens after this, as you didn't exactly give one in this animation.
Oh, well. Problems for another day. Great job, and I hope to see more from you!