This is a folding fan featuring illustrations of characters from Bungo Stray Dogs: Atsushi Nakajima, Osamu Dazai, Doppo Kunikida, Ryunosuke Akutagawa, and Chuuya Nakahara. It appears to be a bonus item from the October 2015 issue of Young Ace magazine. The outer box has been opened, but the fan itself has been mostly unused and stored away.