The City Where No One Was: Summaries
The City Where No One Was This is the first book that Chii takes interest in the end of Chapter 9. You actually get to read the book in Chapter 10. The story is rather simple, a creature wanders around looking at people happy with "those" things. It becomes depressed because of how the city works and sets out to find a person who would be the creatures own.
The Person Only For Me ~The City Where No One Was. This is the sequel to The City Where No One Was. It appears in Chapter 16, and Hideki is the one who discovers it while in the book store waiting for Yumi. The book continues with the creature searching for a person all her own, but now a new character appears. Self-doubt appears in the form of another creature but dark. They two converse and a renewed hope for finding that special someone continues.

The City Where No One Was: Vocabulary
ARE
english translation: THOSE
Persocons, the artificial humans who are luring real people away from interacting with each other. Obviously has a negative connotation.
HITO
english translation: PEOPLE
In this particular context, humans are considered to live in an illusion that they need to wake up from. They are distracted by the "THOSE" and so isolate themselves.