My Friend's Little Sister Has It In for Me! Volume 2 by mikawaghost

Akiteru's intent on living life as efficiently as possible. Ever since Mashiro's shock revelation, up's become down and nothing's as it seems! His friend's little sister went from Annoying with capital A to Sweet with capital S?! Mashiro's grown even colder than before, and he didn’t even think that was possible! His group's script writer's suddenly swapped genres, and even Murasaki Shikibu is sticking to deadlines! What's it all mean?! And how's Akiteru supposed to stick to being efficient when nothing makes sense anymore?