I like the concept here, and the character designs are cute, but it just isn't coming together into anything all that interesting. The characters feel pretty generic so far, though they might develop in a good direction. The action is bland and poorly choreographed. To begin with, I think it's hard to stay engaged with fights against mindless monsters. If the fight choreography were better it could maybe work, but the fights so far feel like they mean nothing and have no stakes. The only manga I've read that made this sort of thing work is Attack on Titan, where they used the story's willingness to regularly kill off characters or have the protagonists actually lose battles make the titan fights entertaining (plus the 3d maneuver gear was visually interesting in use and had interesting limitations, which so far this power system does not). Even then AoT got way more interesting once they introduced human foes, which this story will hopefully do too.
The yuri romance aspect is done better. There's some actual tension in Riri's relationship with Yuyu, and I liked their dynamic with the training thing. It still feels painfully generic. There are a lot of characters being introduced, but they're all characterized so shallowly. They need room to develop.
Overall, the pacing feels slow, and they're dumping a lot of exposition without giving us much reason to care about any of it.
Does the anime do any of this better? I want to like this story, but I don't know if I can.