Made in Abyss: Riko

Riko is a 12-year-old orphan from the town at the edge of the Abyss, Orth. She is the only child of the White Whistle Lyza, the Annihilator. When she was two, her mother began her last dive to the bottom of the Abyss, and since her father, Torka, had died before she was even born, she was left under the care of the Belchero Orphanage. Her dream is to become a White Whistle, a legendary type of Delver, and explore the depths of the Abyss with her group in order to learn its many secrets and to find her mother