Apex domains cannot have CNAME records.
Question and response
Question
dig interq.or.jp. NS
Answer
interq.or.jp. 5 NS ns1.gmointernet.jp.
interq.or.jp. 5 NS ns1.gmointernet.com.
Authority
The response has no authority records.
Additional
ns1.gmointernet.jp. 5 A 157.7.33.254
ns1.gmointernet.com. 5 A 157.7.32.254
ns1.gmointernet.com. 5 AAAA 2400:8500:3000:0:0:0:0:254
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0