My Friend's Little Sister Has It In For Me! Novel Volume 2 was written by mikawaghost and illustrated by tomari.

Akiteru’s intent on living life optimally. Ever since Mashiro's shocking revelation, ups become downs and nothing’s as it seems! His friend’s little sister went from Annoying with a capital A to Sweet with a capital S, Mashiro's grown colder when Akiteru thought she was at her limit, his group’s scriptwriter has suddenly swapped genres, and even Murasaki Shikibu is sticking to deadlines! What’s it all mean?! And how’s Akiteru supposed to stay efficient in this topsy-turvy new reality?