YOASOBI (stylized in all caps) is a Japanese music duo composed of vocaloid music producer Ayase and vocalist Ikura (幾田りら). The group has released four music videos, all of which are based on short stories posted on Monogatary, a website operated by Sony Music Japan, later also from various novels and book tie-ups.

The name “YOASOBI” originates from the Japanese word 夜遊び, meaning “nightlife”. Ayase, who is a producer of the group said