Yoasobi is a Japanese pop duo composed of Vocaloid producer Ayase and singer-songwriter Lilas Ikuta, under the name Ikura. Represented by the slogan "novel into music", the duo originally released songs based on selected short stories and various media like books, letters, plays, etc.

Yoasobi's debut single, "Yoru ni Kakeru", spent six non-consecutive weeks atop Billboard Japan Hot 100 and topping its 2020 year-end chart without CD release, as well as receiving the first ever diamond certification for streaming from the Recording Industry Association of Japan (RIAJ). Besides "Yoru ni Kakeru", three other songs were certified diamonds: Blue Period-inspired "Gunjō", Beastars opening theme "Kaibutsu", and Oshi no Ko opening theme "Idol"; the latter set the record for the longest-running number one in the Japan Hot 100 history for 22 non-consecutive weeks, and the first Japanese act to top the Billboard Global Excl. US, as well as the 2023 nineteenth best-selling global song, according to the International Federation of the Phonographic Industry (IFPI).

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