Listen to piece of cake online. piece of cake is a Japanese language song and is sung by Reika Kitakami (CV: Emi Hirayama) and Shiho Kitazawa (CV: Sora Amamiya). piece of cake, from the album THE IDOLM@STER LIVE THE@TER DREAMERS 02, was released in the year 2015. The duration of the song is 4:20. Download Japanese songs online from JioSaavn.