Mamoru is Misaki and Takeru's oldest son, a 14-year-old skilled swordsman who shares the narrative perspective with his mother before his world changes dramatically.

Takeru is Misaki's husband, known for his cold and reserved demeanor, and is a master of the Whispering Blade technique within their family.

Setsuko is married to Takeru's brother, Takashi, and builds a supportive friendship with Misaki that plays a significant role in Misaki's personal growth.

Robin, a half-Carythian, half-Disan refugee, is a friend of Misaki during their time at Daybreak Academy and played a role in the formation of a vigilante group.

Hyori is the wife of a respected teacher and a close friend of Misaki, characterized by her delicate beauty and adherence to traditional Shirojima femininity.

Chul-hee is a teenage boy from the north of the Kaigenese Empire who becomes friends with Mamoru and challenges his perceptions of their society.