Black Sheep Keeper is a science-fiction novel set in a near-future Sapporo. Tōichi Kiriya, a former police officer with a special ability, lives in isolation under the trauma of having shot his mentally ill sister; meeting an innocent girl gives him a small reason to live again. It won the eleventh Kadokawa Haruki Novel Award.

Kiriya, a former police officer with a special ability, finds a small light for living through an innocent girl he meets in his isolation.