"Halloween Party" is the debut single released by special 2012 Halloween project unit Halloween Junky Orchestra, lead by Hyde and K.A.Z from Vamps. The group contains over thirteen well known Japanese musicians. It was released on October 17, 2012 in two CD+DVD versions and the limited edition includes a bonus booklet. The single debuted at #3 on the Oricon weekly singles chart. The single charted at #80 on the Oricon yearly singles chart for 2012, and is certified Gold in Japan.