>>542175775
So:
In Taima Miko 3, skill trees are represented by books. One of the books is a manga about the "real life" events of the first game (exaggerated to make Nayuta the hero, when she was actually the villain). Another book is about Hyaha Time, which is the loot explosion at the end of a bossfight, a moment the support character Mayuko from Nayuta's game was always excited about.
Tsugumi there is a fan of the Nayuta manga, but Miko notices that both the manga and the Hyaha book are very accurate and similarly written. So the image implies that Mayuko is both the manga author and the book writer. So she's making a killing off being a writer now.