ラヴクラフト

The Register for the story world selected by Historia for the vacation by the sea. She runs the hotel together with the fishmen staff. Extremely shy, she prefers to write down her thoughts at high speed before presenting them to someone to read on her behalf. If she's not talking to someone face to face, she can speak normally and with a much higher pitch (for instance if she's voice-recording for the hotel reception).

 The Register AND main character of "The Shadow over Innsmouth", H.P Lovecraft's sole published full work. Her problems with interpersonal connection lead her to reach out to her pen friend Historia for assistance. Historia was looking for a place to vacation, so took the opportunity to bring the Librarians over in a bid to help Lovie out. Lovecraft eventually reenacts the closing scenes of the work and acts the part of Dagon to get a piece of Eito for herself. Although "causing an incident" was suggested by Historia as an idea to help Lovecraft get physically intimate with Eito as he did with all of the other characters, it seems Lovecraft was both playing the part in jest and for keeps, because of the story setting. 

Lovecraft eventually gives her bookmark to Eito, and she joins the chat group with the other characters where her strange Cthulhu fixation gives her a unique charm in an easygoing chat environment. /