It looks like the most of the main characters from the first episode have assembled together. The invisible girl turned out to be easier to turn than expected. The mysterious samurai also turned out to be both the swordsman from the first episode and a person from Azuma’s past. Presumably, Minami is trying to change the world for the better or something after the events of the civil war from her and Azuma’s childhood. Also, it’s possible the second samurai was her missing father, but that’s just a quick speculation.
It looks like the main antagonist from the first episode has appeared, calling himself the Professor. We didn’t get a great sense of his ability in the first episode, but the quick look this week made it look possibly like the ability to manipulate his blood. Whatever it is, let’s see if we find out his grand plans next week.