"Sangenshoku" (三原色, lit. "three primary colors") is a song recorded by Japanese duo Yoasobi from their second EP, The Book 2 (2021). It was released as a stand-alone digital single on July 2, 2021, through Sony Music Entertainment Japan. The song was featured as a background music for NTT Docomo's mobile service Ahamo advertisement, and based on the novel RGB written by Yūichirō Komikado. The lyrics depict relationships between childhood friends that are still connected even though they live together in different places.