Queen's Quality manga volume 11 features story and art by Kyousuke Motomi.

Even though Fumi has the ability to kill the snake that’s sealed within Kyutaro, she can’t do so without killing Kyutaro in the process! Kyutaro strikes a deal with the snake, but can he make good on his promise if it means facing someone at the Seiryu Clan who has a snake inside him as well?