Be prepared for some extremely depressing stuff, it's Urobuchi after all, and since it's a prequel to Fate you automatically know that nothing good can come from the ending.
Though I also REALLY wouldn't recommend seeing this unless you've finished all 3 routes of FSN, Zero kinda assumes you've completed all of Fate and know about everything since it doesn't hesitate to toss out massive spoilers for Heavens Feel. It also somehwat assumes you already know the characters.
It works alright if you enter it fresh, but the best possible experience is reading/watching it already knowing everything from Fate.
Urobochi just wrote it out. Nasu still told him what to write. The only thing that Urobochi added to the story himself was that Lovecraftian monster of caster. The story behind FS/Zero is technically not his work, but Nasu's.
Kuji-kiri said: Urobochi just wrote it out. Nasu still told him what to write. The only thing that Urobochi added to the story himself was that Lovecraftian monster of caster. The story behind FS/Zero is technically not his work, but Nasu's.
It's something of both really, the afterwods of the first volume mentions how Fate/ZERO was a work that made Urobuchi continue as a writer, it helped to get him out of a kinda slump he was in.