Kuroko no (hi)Album Oneesama no HIMITSU ♥ ~Kaizokuban~ (黒子の(秘)アルバム お姉様のHIMITSU 海賊版?), translated as Kuroko's (SECRET) Album of Oneesama Bootleg is a Toaru Kagaku no Railgun artbook featuring art of Misaka Mikoto by various artists. It was released by ASCII Media Works on December 31, 2010.
A tribute by popular artists to the Dengeki Daioh serialized series Toaru Kagaku no Railgun. Under the concept of "Shirai Kuroko's voyeur album", well known illustrators who are also Railgun fans depict Misaka Mikoto in candid shots. In addition, the illustrations that are compiled in the album also comes with illustration card packs!
All artist links are from Pixiv except were noted.