That was a good start
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The beginning was honestly as cryptic as in the game so I'm pretty happy with that. Just dropping right into this world and getting familiar with the Abydos girls and their situation. Getting a tutorial type battle out there. Also covering how these girls are absolute tanks. Can take bullets to the face and it's more painful than you know...fatal. Shiroko got absolutely merciless there which was really satisfying
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Something really and truly satisfying in seeing these characters in motion. Shiroko looking absolutely cute throughout the episode. But nice to see Hoshino and the others as well. Lot of little details and plot points dropped in this one while setting up the story to really roll on from here.
Also that OP is absolutely gorgeous. The song was great and I've got no complaints there. But they really poured the heart and soul into the visuals. Someone could make a frame by frame breakdown of this OP to go over all the details and foreshadowing. Some shows can only get by with using in-episode material to cobble together something resembling an OP. And some OPs are almost cinematic in how good they are. This is certainly on the latter side.
Glad they didn't do anything stupid like cutting out Sensei from the story. Without that character it simply wouldn't work.