Apex domains cannot have CNAME records.
Question and response
Question
dig ohtaki-tangyo.com. NS
Answer
ohtaki-tangyo.com. 5 NS ns-1080.awsdns-07.org.
ohtaki-tangyo.com. 5 NS ns-1778.awsdns-30.co.uk.
ohtaki-tangyo.com. 5 NS ns-34.awsdns-04.com.
ohtaki-tangyo.com. 5 NS ns-711.awsdns-24.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0