Sayu in the original anime series was one of the worst main characters ive seen , like almost as bad as Yuki from Mirai Nikki, she would watch her friends or multiple people she swore to protect die to the monsters and take forever to draw her sword and do something about it, she would also never use her OP red eye powers until she gets beaten down and just one shots the enemy. Like if she was smart she would use that power from the beginning and minimize casualties and saved so many. In the sequel movie, The Last Dark, shes an absolute beast, shes literally the polar opposite of her former self, she would use her red eye powers to basically 1 shot assassinate her foes before they have a chance to fight back and if she did get into a full on fight, she would look for an opening and strategically use her red eye powers to deliver the killing blow.
For me the biggest let down was the change in art style, the original 2011 anime series animation and artstyle was straight up eye candy for its time and still holds up very well to this day, they should have kept it instead of going the heavy CG route .
I would say its definitely worth watching , even if u didnt like the Blood-C series, its a big improvement but there's a lot of CG to digest.
