テイル

A mysterious girl Eito finds and awakens in a bleak and empty world. She immediately latches on to him as her "Prince Charming" and shortly after they are transported to the Great Library. As she has amnesia and remembers nothing about herself, Eito names her "Tale" and resolves to stay at the Library until he helps her recover her memories and the story she is the main character of.

Tale stays by Eito's side during his adventures and shares a room with him when they rest for the night. She starts a diary soon after she arrives in the hopes it will help to recover her memories as her encounters and experiences with Eito increase.

 Friendly, optimistic, positive and easily excited by new things, Tale acts as Eito's emotional support during his adventures. After meeting other characters and registers, she usually attaches the "chan" suffix to their first names after meeting them for the first time. Because she has no memory of her past, she is unprejudiced and is always on the lookout to make more friends. She frequently asks Eito and the others about unfamiliar terms and concepts, including those which are inappropriate for someone with the mental age and innocence of a young child.

Tale is really the "Prima" of the story Historia wrote with help from Shiori. Grimoire (as Iris) created her based on the template of "Sleeping ******es awakened by their Prince Charming". She adores Eito and is physically affectionate with him from the outset.

Although Tale does not have the combat ability of the other characters, her experiences written down in her diary prove to be the solution to the problem of maintaining a story without robbing pages from other stories. 

As her story is all about visits to other tales and her experiences, she is allowed to work as a Librarian and enter other stories as a guest because her tale lacks a significant "mental imprint" which could negatively impact the host story if she stays for an excessive period. 

In the end, she stays and work by Eito's side in his editorial job and can return freely to the Great Library and her own story via Eito's Colette. /