I have Nioh for PC. It works perfectly with the xbox controller. When I try to play with keyboard & mouse, only the keyboard works; the mouse does not. Can you play Nioh for PC with a mouse?
Nioh does not support mouse configuration as mentioned here
The article states:
A recent press release from KOEI TECMO America and Team NINJA, reveals that the PC release of Nioh does not have mouse support. Dubbed Nioh: Complete Edition, it’s stated that while the title does support a keyboard, it’s best played via a game controller.
EDIT: I did some further looking. There is a mod which I found through a steam forum post It talks about the fact that it is possible and then links to a youtube video. With a slightly older version GPDSCK 3.1
Now I do not own Nioh myself. But from the amount of people commenting on it. This seems like the best solution as of now.
EDIT 2: as @Nolonar mentioned. There has indeed been an official update regarding Nioh's mouse support. You will however need to rebind the keys. I suggest you check the options menu in the game and check if it is possible.