Apex domains cannot have CNAME records.
Question and response
Question
dig dns.ne.jp. NS
Answer
dns.ne.jp. 4 NS ns1.dns.ne.jp.
dns.ne.jp. 4 NS ns2.dns.ne.jp.
Authority
The response has no authority records.
Additional
ns1.dns.ne.jp. 4 A 61.211.236.1
ns2.dns.ne.jp. 4 A 133.167.21.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0