かぐや

The polar opposite to Hourai, Kaguya embraces the tools of modern technology in her quest to be the biggest Yumetuber (Story world Youtube equivalent) personality ever. Her desire to be loved by all has been updated for the modern age, if modern audiences do not know and love Kaguya for her charms, she'll pull out all the stops to make it a reality.

She channels the power of her devoted web audience into a blinding glow which helps other characters and the Librarians better attack the worms.

Generally lazy, but if she's sufficiently motivated she can accomplish tasks beyond the scale of most mortals in a short span of time.

 Kaguya is exasperated with Hourai's inability to comprehend modern concepts like webcasts, so she's forging ahead with her goal without caring for Hourai's anxiety. Their relationship built over centuries isn't so easy to cast aside, so Kaguya still has the habit of calling Hourai "Mama" despite her intentions. 

Unlike the other protagonists, Kaguya has not been corrupted by Grimoire's worms. Her selfish desires and childishness do have severe consequences when the Moon Palace is attacked by Grimoire for its pages. 

When Grimoire's assault is fended off, Kaguya hires Eito and Tale as her producers. A big collaborative live concert is eventually planned with four of the other protagonists, but it nearly comes a cropper when Kaguya injures herself during her training regimen. Eito saves the day by taking leave and talking to all of the participants in a bid to keep the practise schedule alive, and the concert goes ahead for the first and only time. /