This double A-side single includes "Who are you?", which will be the outro theme song for TV anime "Boruto: Naruto Next Generations" in July, and "Seiza shite Futari", which presents a new side of the band. The song "Seiza shite Futari" features Arisa Ushimaru of yonige as a featured vocalist. Regular Edition includes remix version of "Seiza Shite Futari" by Kabanagu. Sleeve case packaging.