This is the artbook for "Boyhood's End".
It includes PDF files in four languages: Japanese, English, Simplified Chinese, and Korean.

How to Access the Artbook
1. Right-click on "Boyhood's End" in your Steam library and select 'Properties'
2. In the Properties window, check under 'DLC' to confirm that the artbook is installed
3. Right-click on "Boyhood's End" in your Steam library and click 'Manage' > 'Browse local files'
4. File Explorer will open, and you'll find the artbook PDF file inside the 'Artbook' folder