Sequel to previous release "Sneaking Shadow" with an original drama "KING of CASTE -Bird in the Cage-" and latest drama track. New cover by Utako Yukihiro. Includes two new drama insert tracks: "Who is the King?" is common for the Hoo Gakuen Koko ver. and Shishido Koko ver. and "I for you" is in Shishido Koko ver. Shishido Koko ver.[Limited Edition] comes with one can badge randomly selected from 7 types.