Tsubasa by Clamp

"A Del Rey Book"--T.p. verso. "Tsubasa crosses over with xxxHolic. Although it isn't necessary to read xxxHolic to understand the events in Tsubasa, you'll get to see the same events from different perspectives if you read both!"--T.p. verso. Book is printed "manga-style" in the authentic Japanese right-to-left format. Translated from the Japanese.