yay new chapter !!! as always, thanks so much for your hard work team duwang!!!
The whole blood thing is pretty interesting to me. When they first mentioned blood I thought it was going to be like in the Washizu arc of Akagi, but it's the opposite (which is good). And when Yakou talked about the idea that a person's karma is in their blood, I immediately thought back to the flashback a few chapters ago when the mysterious person (who for now I am assuming is Tatsuki) said: "maybe what's abominable is our blood". So it seems like this arc is going to explore some philosophical questions/ideas about blood and its relation to stuff like karma, which I am all for.
Other thoughts:
Marco (with his 50 yen coin) is adorable as always
The doll is creepy as hell! but I also love creepy stuff
The last scene/panel was great! Baku is the best!
(Also just remembered) the fact that the password can only be entered three times before becoming invalid, is the explanation for why Tatsuki corrected himself last chapter (and not in relation to Marco's intelligent, which I also assumed)