Taeko Mikado

Taeko Mikado (御門 妙子 Mikado Taeko) is the mother of Chihaya Kisakinomiya and Chitose Mikado who makes Chitose transfer to Seio Girls' Academy from which she graduated. She forgot Chitose because her daughter Chitose's death affected her mind and she is doted upon by Chihaya after that.

Chihaya Kisakinomiya
Chihaya is Taeko's son where Chitose Mikado's death affected her mind that Taeko made Chihaya dress up as a girl and attend Seio school.

Chitose Mikado
Chitose is Taeko's daughter who died when Chitose was 10 years old.

Fumi Watarai
Fumi is the Kisakinomiya family's maid for generations