Maki was left in an orphanage, named Kogamo no Ie (コガモの家), after her mother was arrested for involuntarily causing hurt. Here, she meets "Post", a girl who was abandoned at birth at a baby hatch and other children who have been abandoned by their parents or are taken into under state care due to a history of child abuse. Kogamo no Ie is run by Sasaki, an eccentric housekeeper who runs the orphanage with an iron fist.
The children at the home faces discrimination from the wider society as well as the psychological trauma of being abandoned at the home. While many of the children harbour the hope of eventually being adopted into a loving family, Maki clings onto the hope that her mother would return one day to claim her from this orphanage.