Rainbow is the first album of Sayaka Yamamoto, a member of Japanese idolgirl groupNMB48. She made her solo debut with this album. It was released on 26 October 2016 under the label laugh out loud records. There are two editions. The limited edition includes a DVD with music video and the regular edition has only audio CD.
A musician Shikao Suga and Takuro, a guitarist of the rock band Glay provided a song but most of the songs and lyrics were written by herself. The sound producer is Seiji Kameda. He is best known as the former member of Tokyo Jihen.