Yoasobi (stylized in all caps) is a Japanese music duo composed of vocaloid music producer Ayase and vocalist Ikura. 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. Both members of Yoasobi had active music careers prior to forming the group. Ayase gained a following on the video hosting site Niconico since his first upload on 24 December 2018, a song titled Sentensei Assault Girl (先天性アサルトガール).