January 9 18 175 cm (5'9") Unknown Passing the time, Enjoying the nature Unknown Unknown Unknown Light Blue 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)