PRIVATE WAREHOUSE 
This is a Japanese-language illustration (art) book.
Soft cover, 125 pages art work book of the "Sky Girls" OVA series filled with tons of colorful illustrations and sketches of all the characters that appeared in the OVA series including mechanical designs of the flying armored mecha suits that the girls pilot. In-depth interviews with the cast and staff are included, as well as a nice screen captures of the OVA series arranged in comic book style complete with speech bubbles for you to read through the OVA.