Since ancient times, there exist human-like beings called ‘Ajins’ who descended from beasts and who possess special abilities and serve as ninjas to those that hold power. Two such nekomimi ninjas, Yura and Tama, came from the village of Fuuma to serve the protagonist as part of a contract from a long time ago. He resisted their loving advances at first, but gradually he was taken by their charm and determination. Even as he pondered how he would pay for their expenses and if there was even a need to have ninjas protect him, he began to see himself as their master. However, who is the person watching them from the shadows?