Yoasobi is a Japanese pop duo formed in 2019 by Sony Music Entertainment Japan. It is composed of Vocaloid producer Ayase and singer-songwriter Lilas Ikuta, under the moniker Ikura. Represented by the slogan "novel into music", the duo originally released songs based on selected short stories posted on Monogatary.com, a social media website for creative writing operated by the label. Sources later also come from various media like stories written by professional authors, books, letters, plays, etc.

Sony Music Entertainment (Japan) Inc. , often abbreviated as SMEJ or simply SME, and also known as Sony Music Japan for short, is a Japanese music arm for Sony. Founded in 1968 as CBS/Sony, SMEJ is directly owned by Sony Group Corporation and is operating independently from the United States-based Sony Music Entertainment due to its strength in the Japanese music industry. Its subsidiaries include the Japanese animation production enterprise, Aniplex, which was established in September 1995 as a joint-venture between Sony Music Entertainment Japan and Sony Pictures Entertainment Japan, but which in 2001 became a wholly owned subsidiary of Sony Music Entertainment Japan. It was prominent in the early to mid '90s producing and licensing music for animated series such as Roujin Z from acclaimed Japanese comic artist Katsuhiro Otomo and Capcom's Street Fighter animated series.