You can change the code font here:

https://leanpub.com/YOUR_BOOK/theme

...making sure to replace YOUR_BOOK with your book's unique web address.

To change the code font, scroll down to "Code Font" and select "wqy-microhei-mono" from the dropdown.

Next, scroll down and click the blue "Update Theme" button.

The next time you create a preview, you should see the Japanese characters appear just as you type them in each code block.

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