From Viz:
In the late 19th century, Great Britain rules over a quarter of the world. Nobles sit in their fancy homes in comfort and luxury, while the working-class slave away at their jobs. When young Albert James Moriarty’s upper-class family adopts two lower-class orphans, the cruelty the boys experience at his family’s hands cements Albert’s hatred of the nobility he was born into. He asks the older of the two boys - who has a genius mind and a killer instinct—to help him rid the world of evil, starting with Albert’s own family.

Official:
Read For FREE on Shonen Jump Plus, Zebrack Comic
Digital Shueisha, Yangjiang+, Comico, Piccoma
Paperback Shueisha, Jump Square

Official English Translation: Viz
Others:
French ((Kana, Mangas.io), German,
Korea (Kakao Page, Manyeo Comics, MrBlue, Naver Series, RIDI),
Polish, Spanish