The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat ED : A Promise

Aira Yuhki's 15th single! The leading song "A Promise" is the theme song for the outro theme of the TV anime "The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat (Sekai Saiko no Ansatsusha, Isekai Kizoku ni Tenseisuru)". The song is arranged by Mr. Masayuki Hasuo (siraph, ex.School Food Punishment), who has opened up a new frontier in his own musicality. This album contains two couplings. The title track "A Promise" is sung by the female character of the movie, Dia (CV: Reina Ueda). A total of 5 tracks including the instrumental ver. for each song. Newly drawn illustration back cover artwork.