Apex domains cannot have CNAME records.
Question and response
Question
dig secure.ne.jp. NS
Answer
secure.ne.jp. 5 NS ns0.cpi.ad.jp.
secure.ne.jp. 5 NS ns1.cpi.ad.jp.
Authority
The response has no authority records.
Additional
ns0.cpi.ad.jp. 5 A 122.200.253.230
ns1.cpi.ad.jp. 5 A 122.200.212.130
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0