Holy crap that was a great episode! Not only do we get the Saoran and Sephiro flashback from the manga, but also three very emotional death scenes (which would have come as a suprise had some irresponsible posters ruin it for me). The English manga is not up to this point yet, so almost everything (with the exception of the flashback, which was taken from an earlier volume of the manga) will be new for most viewers.
This episode seems to be purely driving the plot forward. No more "let's base an episode, mid arc, all about Sakura" that we got earlier in Outo and at the begining of this season in Hanshin. I couldn't really think of that much filler at all really. Great animation (check out the character designs in this ep compared to the Hanshin arc. Suprisingly different!) and that music... wow!
Kurogane fans should love next episode (that means me!) and it is unclear if it will be the last Outo episode. As it stands, this will be the 7th episode in the Outo arc, though what an arc! Could be an 8 episode arc if next week is the conclusion, or a 9 if it isn't. Also worth noting, there are only 3 more episodes left this season. If they wanted to extend the Outo arc more over the next 3 episodes (up to episode 26), the season finale could be the Outo finale or a finale and a cliffhanger with the gang arriving in the next world. Hmmm...