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 guess he still gets excited coming here,
being a former staff member.
La sangre de exbibliotecario ruge 
con fuerza, ¿eh, Hasuta-kun?
O Hasuta-kun deve estar empolgado de
 voltar ao seu antigo local de trabalho.