A novel by Mitsuki Tsujimura, winner of the Booksellers Award, unfolding a fantastical story. Poplar Bunko - Title: Lonely Castle in the Mirror, Volume 1 - Title: Lonely Castle in the Mirror, Volume 2 - Author: Mitsuki Tsujimura - Awards: Booksellers Award Winner It looks like there are four books, but it's a double cover with the anime version cover over the usual cover, so there are actually only two books in total, one for each volume. The condition is generally good.