Tantei Opera Milky Holmes is a media franchise by the company Bushiroad which has been released as an anime, manga and game. The story centres around a detective agency named Milky Holmes. The agency is run by Opera Kobayashi and includes four young detectives.

The voice actresses of the four detectives visited the UK and performed at Hyper Japan to promote the anime release. Mikoi Sasaki voices Hercule Burton (dressed in green), Sora Tokui is Nero Yuzurizaki (dressed in yellow), Suzuko Mimori is Sherlock Shellingford (dressed in pink),  and Izumi Kitta is Cordelia Glauca (dressed in blue). They performed two songs, Neppu Tairiku Bushiroad and their signature tune Ameagari no Mirai.