Winner of the 37th Dazai Osamu Prize, this novel follows Hikaru, who grew up in a care facility and has relied on a mother-child notebook as her only link to her mother. As she encounters traces of a mother who shares her name, she tries to confirm her own existence. It quietly explores the depth of loneliness and the urgency of reconnecting with someone.

The mother-child notebook that was her only connection pushes Hikaru out into the world.