So... I'm really sorry to tell you, but Takt Op have an awful story.
The anime has really good music, really good chracter desigin, choreographic and beautifull fights... I had a lot of expectation for this anime and staff (I absolutely love Mafumafu's music for example), buuut the storytelling is really bad and turned out to be just a mobile gacha game adverstiment. That made me mad.
I feel so bad for investing time in this... Story takes a huge part of my judgement and I couldn't stand that. A lot of things come from nowhere, a lot don't have explanations in the anime, the villains are so pathethic and previsible, the show has a lot of deus ex machina and so on...
Don't watch it if you care about the story.
Story: 1/10 awful
Art/animation: 10/10
Sound: solid 10/10
character: ~7