Kamishiro Kotone

Mamoru's older sister, who survived the village fire and was adopted by the Kamishiro family alongside Mamoru, becomes the "pearl" among them.

Kotone is an amiable girl who treats everyone equally and spends most of her time in the garden admiring flowers. She loves her family and is willing to go to any length to protect them, especially her beloved little brother, whom she cherishes the most.

It is later revealed that Mamoru and Kotone are not related by blood, which Kotone is well aware of.