>>268185
>>268211
The gacha has a main storyline called singularities, in different historical periods, all written by Nasu and is canon. It even went further to retcon the original VN, but hardcore fans refuse this.
I played them and they're honestly good, it's more fate if you want it. And the main story is finished btw, they just announced act 2, but ignore it, it will probably be shit. Also keep in mind that Nasu will probably not make a new VN ever.