The Haganai x HenNeko Promotional Book is a promotional book that was given out for free on December 31, 2012 at Comiket 83's Media Factory booth. It has two manga chapters from the Boku wa Tomodachi ga Sukunai and HenNeko series. The cover features Yozora Mikazuki and Tsukiko Tsutsukakushi.
The book contains a manga from both series, an intro from both light novels and a character/situation summary from both shows.
Dubbed HagaNeko, a collaboration event was held between Boku wa Tomodachi ga Sukunai and The "Hentai" Prince and the Stony Cat. starting December 27, 2012. It was held to build anticipation for the two series' upcoming anime releases. This book was part of said collaboration.
- The band around the outside of the book advertises the Boku wa Tomodachi ga Sukunai: Buriki Art Works book.