Onikira is a 2D side scrolling beat ‘em up set in a fantasy feudal Japan where the player takes on the role of a samurai fighting to prevent the forces of the Japanese underworld from breaking through into the world of the living.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam