Death March kara Hajimaru Isekai Kyousoukyoku Extra: Arisa Oujo no Isekai Funtouki

Reincarnated as a princess, It's my win? Arisa is the main character of this Death March spin-off! A story before Satou came to the another world: the secrets behind Arisa's reincarnation, the details of her life and the like, finally revealed!

(Source: ComicWalker)