The Sakamaki brothers are the sons of Karlheinz, but from three different mothers. The oldest sons, Shū and Reiji, were conceived by Karlheinz's second wife, Beatrix. The triplets, named Ayato, Kanato, and Laito, were born from Karlheinz's first wife, Cordelia. The youngest, Subaru, came from Karlheinz's third wife, Christa. Even though they are brothers, they don't get along with each other, and they seem rather distant due to the way they were brought up but their father had a secret child out of the marriages and he had no choice but to bring them home since he was going on a business trip