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...
Sadly, my relationship with Mahiro-san 
did not develop any further.
Pero finalmente mi relación con 
Mahiro-san no avanzó nada...
Infelizmente, o meu relacionamento
 com o Mahiro-san não progrediu em nada.