Maidens of Cygnus (キグナスの乙女たち) is a spin-off of the Mahouka Koukou no Rettousei series.
The series moves away from the Shibas and focuses on Iba Alisa, the half-sister of Juumonji Katsuto who came about due to their father having an affair before remarrying after the death of his first wife.
The series currently consists of a three chapter prequel released as a web novel on Sato Tsutomu's (佐島 勤) official website and is due to be released as a series of light novels.
When is the next chapter coming?