I wrote english installation instructions to get DDLC in Japanese here:
Using Textractor+Chiitrans Lite will be the most comfortable setup, it’s just not so easy to set up and apparently Textractor only works on Windows.
It will be like having Yomichan for the Browser (can hover over words to get definitions)
Instructions here:
Or you can read the script text files in the browser of course. It’s not nearly as comfortable though.