Yoasobi

Yoasobi is a Japanese musical duo formed in 2019. It consists of songwriter and producer Ayase and vocalist Ikura. Represented by the slogan "novel into music", the duo's narrative-driven songs are originally based on selected fictional stories posted on the website Monogatary.com. Later, sources also come from various media, such as fiction written by professional authors, books, letters, messages, plays, and social media posts. Known for fast pace and complex structure, their music has been characterized as a blend of J-pop and Vocaloid music.

Rising to prominence during the COVID-19 pandemic in Japan, Yoasobi's debut single, "Yoru ni Kakeru", spent six non-consecutive weeks atop Billboard Japan Hot 100 and topped its 2020 year-end chart, the first ever non-CD single to do so, as well as receiving the first ever diamond and double diamond certifications for streaming figure from the Recording Industry Association of Japan (RIAJ). Three other songs were also certified diamonds: Blue Period-inspired "Gunjō" and anime series openers Beastarss "Kaibutsu" and Oshi no Kos "Idol"; the latter set the record for the longest-running number one on the Japan Hot 100 history with 22 non-consecutive weeks, and the first Japanese act to top the Billboard Global Excl. US, as well as one of the best-selling songs worldwide in 2023. With these successes, several publications dubbed the duo a representative of J-pop of the 2020s and the Reiwa era.