This is a Japanese-language book or magazine about aircraft and/or aircraft modeling. Some Japanese aircraft books, such as the Aero Detail series contain complete English text as well. See the product description below for details.
While called a "Reppu field guide" (and indeed very extensive coverage of the Reppu is provided) this is also a guide to Japanese Naval Aviation in general and late-war Naval Aviation in particular. Coverage of the Raiden, Shinden and Shusui is given, as well as the Bearcat and Sea Fury for comparison. Hardcover. All text is in Japanese.