The Celaeno Library in the Pleiades star cluster is home to the largest book collection in the universe. It's said that even variants of Yiu-th only handed out at events can be found there. Mahiro is dragged along for some reason as Nyarko goes there to return a book. Hasuta, a former worker at the library, does his best to show Mahiro around, but they soon encounter two evil deities who have infiltrated the library...
I'm sorry, I'll only let Nyarko 
know of my precious spot.
Lo siento. Solo le enseñaré a 
Nyarko lo más importante que tengo.
Desculpe, mas só a Nyaruko saberá
 onde fica o meu ponto secreto.