Yeah, I can see why you would say the Mutsuki possession arc drags.
Because it does. It's getting really monotonous now. He gets the belt, turns evil, then loses the belt, gets it back, Kenzaki meets him at his school to question him about the belt, he feigns ignorance, rinse wash repeat.
The introduction of Tachibana's one time mentor from BOARD turned vigilante (who only lives for what, three episodes?) didn't really amount to much.
I'd call it filler if it weren't for the developments that happened in the background, like the crisis Chalice is going through at the moment, Tachibana getting a reason to become Garren again (WHEN IS HE GONNA USE THE JACK CARD?), and Nozomi realizing that her boyfriend's normal personality was just fine the way he was.
Couple that with the two new high level Undead targeting Kotarou that hacked the Undead Radar, and Chalice's serious grudge against both Leangle and Garren after the beating he took from the both of them in this and the Isaka arc, respectively.
It's good that stuff is happening, but there's still a big focus on a dragging sub-plot.
On the topic of subs, the only thing I was able to find was TV Nihon, which is fine as long as you ignore the incomprehensible translation of the opening song.
http://ryuganon.wordpress.com/2011/07/15/round-zero-brave-blade-translated-song-lyrics/
There was one strange sarcastic line that stood out to me in one episode, but it's minor.
On another side note, can anyone give me some non-spoiler context to this song? I really like it, but I have no idea who the hell is singing it (it's none of the lead actors, as far as I can tell), let alone what it was made for.
[ame="http://www.youtube.com/watch?v=aD3ucQW2mpU"]Kamen Rider Blade Song Collection - Never Too Late - YouTube[/ame]