We have found out that a recent update to the Steam client results in an error when trying to access the help from the game. While we look for a solution to the problem, you can still open the help doing the following:
【Local Version】
Followin the steps below, you can open the local version of the help

4: Open the folder: 「A-Tourism_Data」>「StreamingAssets」>「html-document」>「webdocs」
5: Open the folder for the language you want to read in, see list at the bottom.
6: Open the index.html file.
【Online version】
Open the following URL in any browser:
https://www.artdink.co.jp/manual/a-tourism/steam/[Language Code]/
Language code
・English「en」
・Japanese「ja」
・German「de」
・Simplified Chinese「zh-CN」
・Traditional Chinese「zh-TW」
・Korean「ko」
Sorry for the disagreement