ns.example.jp has no CNAME records.
Question and response
Question
dig ns.example.jp. NS
Answer
The response has no answer records.
Authority
jp. 823 SOA z.dns.jp. root.dns.jp. 1772190003 3600 900 1814400 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0