Apex domains cannot have CNAME records.
Question and response
Question
dig spin.ad.jp. NS
Answer
spin.ad.jp. 4 NS ns01.vips.ne.jp.
spin.ad.jp. 4 NS ns00.vips.ne.jp.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0