Played since February (the day where collab Chainsaw Man was).
The Story itself cover a lot on this game, alongside witty dialogue, best trio squad (Counters and Matis my favorite), and several lore on NIKKE worldbuildings that you might hooked a lot.
Gameplay is quite fine, although it might get repetitive but I see this dev manage to make some innovation on Mini-Games, Events with own Story (Overzone/See.You.Again event quite neat imo).
The only thing you might need to deal with is Level Cap (160>200>201+), which you need to get 5 nikkes to get Max Limit Break (3), at least.
Music and Graphics are great and VA of this game is perfect. I like both Jap and KR va tbf.
Getting SSR is either hard but not really hard, getting Pilgrims are other story, so you had to resort of farming free Gems/SSR/SR mold as well as Social Points. (For f2p player)
I think its a good game. Although, some gacha mechanics were either plain terrible. (Recent Skin Gacha Rupee/Drake)