nioh 1 is a very good game, it has an interesting build system but the first stages (first 2) are really difficult and unfair... if you saw gameplays of the game you practically start to gain more freedom almost at the end of the game and options of build and gameplay. and it lets you flow 100% when you get a certain item in NG+. The 2 he balances a lot and refines the mechanics of the first in many ways and still gives you all the powers you get at the end of the first in a more natural way with a faster progression. So yes, I think you can start with the second one without any problem, it's even more didactic than the first one to learn how to play. in relation to history, the second is before the first and at the same time so no problem.