Shiranai Koto Shiritai -

Inside, there were no titles, no authors. Just page after page of strange facts:

There is a jellyfish that is biologically immortal. It ages backward when injured. It has died zero times, but started over three hundred. shiranai koto shiritai

A forgotten language in the Philippines has a word for the sadness of a door that will never be opened again. Inside, there were no titles, no authors

She began to wonder: Who writes these? Why do they appear only at night? And what happens if she never returns the book? there were no titles