I don't usually write reviews. But, I have to say, this is in my opinion a great gacha game.
The story isn't mind-blowing compared to other games (especially FGO). But its by no meansa slog, with very detailed world building and lore. The story will keep you guessing the longer you progress. Personally enjoy the MC not being a self-insert and having his own motivations and goals.
Visuals and Gameplay are amazing with a big majority of characters and skins being live 2d. It helps make the characters feel alive, that also has nothing to say for the animations in combat which are just stellar.
In terms of grind, the fact that you only have to three star a level for it to use a sweep mechanic helps making this game a potent side-game or really a good gacha game for people with heavy schedules.
Overall, a good gacha game, at least worth trying.