Mikunoyoasobi is the second extended play (EP) by Japanese Vocaloid producer and songwriter Ayase. It was originally released exclusively on CD to Tower Records Japan store on January 6, 2021, through Sony Music Entertainment Japan.[1] Subsequently, the EP was available on streaming platforms on September 21, 2023, two years and eight months after its original release.[2]Mikunoyoasobi contains cover versions of seven tracks from Yoasobi's debut EP The Book recorded by Vocaloid software voicebank Hatsune Miku, including "Yoru ni Kakeru", which originally appears on the CD version of Ayase's debut EP Ghost City Tokyo.[3]