The Japanese cast includes Shouta Aoi as Gerald Stuart, Asami Seto as Gerald Stuart, Tetsuya Kakihara as Keith Claes, Sora Amamiya as Keith Claes (in early childhood), Tatsuhisa Suzuki as Alan Stuart, Mutsumi Tamura as Alan Stuart (in early childhood), Yoshitsugu Matsuoka as Nicole Ascart, M.A.
O as Nicole Ascart (in early childhood), and Maaya Uchida has been cast as Katarina Claes.
The series features the opening theme “Andante ni Koi o Shite!” by angel and the ending theme “give me ♡ me” by Shouta Aoi.