These are the instructions for installing the 18+/H-scene patch for the Steam version of Aokana/Ao no Kanata no Four Rhythm.

This patch includes the 18+ CGs and H-scenes, as well as adult versions of the CGs that had been censored for the Steam version.

1. Open Steam, right click on the game, and click "Properties"
2. Click the "Local Files" tab at the top
3. Click "Browse Local Files"
4.Copy and paste the "adult.dat" file into the "Aokana_Data" folder 
5. Launch the Game!

Thanks, and enjoy the game!
-NekoNyan