How to find the registrar of a Japanese domain?

Question

Domain Name System

Good day. You need to know the registrar of the Japanese domain gr8.jp .
I tried several Whois services, including whois.jprs.jp.
Everywhere only the contacts of the domain owner and other information are indicated, the registrar himself is nowhere to be found.
Perhaps someone knows a method, how to find out in a different way, I will be grateful.

Answer 1

.edited Not
really. Somehow they're clever.