Birthday: January 9th Age: 18 Height: 175 cm (5'7") 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".
[Source: extra pages from chapter 18]
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.