The person that Nai is looking for. He is 18 years old, and is described by Nai as a gentle person, but their connection is still unknown.He calls Nai his "special child". His current status is unknown. His dead body was found on the ground, when Nai went ot resuce him. But at the same time, there was someone else, with his face and figure standing next to the body claiming to have "become one" with Karoku. Thus indicating that the "Karoku" that Nai knew no longer exists.
- The "Ka" in his name means applaud, praise, esteem and "roku" means fief, allowance, pension, grant, happiness.