Japanese characters used for the Google Chrome menus and bookmarks suddenly changed and they became "strange" like this (looks like Chinese character font) :
Don't know why this happened, but I managed to fix in the following way.
1. From the icon at the top-right corner of Chrome, choose Settings.
2. Scroll down and click "+Show advanced settings"
3. Scroll down, look for Languages, and click "Manage languages"
4. Click the Add button at the bottom-left and add the Japanese language. Then click "Display Google Chrome in this language" and close the browser.
5. Repeat the above steps, and choose "English" to change back the language.