We propose a concept in this poster paper, the Kuroko Paradigm, which is able to enhance user engagement during interaction with an augmented reality (AR) avatar by adding a physical object to the interaction with the avatar. With the development of AR and VR, interactions between users and AR avatars have been realized with different approaches. However, most of such interactions and experiences are passive, from which users do not expect a high level of engagement. We hypothesize that by introducing a reality actuator, such as a robot or a drone, to handle a physical object triggered by the user without being noticed, and rendering AR avatars as interacting with the physical object at the same time, user engagement during the experience will be enhanced. To prove this concept, we conducted an experiment emulating a classic game of catch. In the experiment, a user will try to throw a ball to an AR avatar, and the ball will be caught by a reality actuator. From the user's perspective, the ball is caught by the AR avatar. In the future, we plan to extend the experiment by adding control groups with differing conditions.