Birthday: January 9
Age: 18
Height: 175 cm (5'9")
Blood Type: Unknown
Likes: Passing the time, Enjoying the nature
Dislikes: Unknown
Food he Likes: Unknown
Food he Dislikes: Unknown
Hair color: Light Blue
Eye color: Blue

According to Nai, he appears to be a gentle person. For some reason he was living in Niji Forest, a place people don't approach and where it is difficult to see through refracted light and mirages. The fact that Nai is an animal is related to him somehow, but...?

The "Ka" in his name means "applaud, praise, esteem" and "roku" means "fief, allowance, pension, grant, happiness."

According to Nai, he left the bracelet by the sea covered in blood and disappeared. At present, information about him is unknown. He seems to have a deep connection with Nai.

(Source: extra pages from chapter 18)