Tsubasa is a shonen mangaka best known for writing the Dark Hero's Revenge Story. She's the senpai to both Koyume and Kaos, and shares a room with Ruki.
What makes Tsubasa memorable is how she basically lives her manga—she acts out shonen tropes like they're just normal everyday stuff, and her personality bleeds into her character work pretty heavily. It's not uncommon to catch her sleeping through class, though that's mainly because she's up all night grinding on deadlines. Koyume clearly has a thing for her, which Tsubasa probably doesn't think too hard about while buried in manga pages.
Content compiled by AnimeList.moe from publicly available sources.
