The Experimental Prison
and the Guard Girl

An official Milgram light novel series exists, featuring other instances of the Milgram prison, with different instances of Es and Jackalope, different prisoners, and a different trial system. The first book has also been adapted into manga format, available in Japanese here.

Neither book has received a full and public translation, while the manga is still ongoing. Nevertheless, what is available translated is linked below, and you can click on each cover to go to the page to buy the books in Japanese.

Pai on the Milgram Stanclub Discord has translated both books, and is willing to send them to anyone who has legally purchased the two books.