Apex domains cannot have CNAME records.
Question and response
Question
dig yamani-japan.com. NS
Answer
yamani-japan.com. 5 NS ns-1891.awsdns-44.co.uk.
yamani-japan.com. 5 NS ns-1682.awsdns-18.co.uk.
yamani-japan.com. 5 NS ns-54.awsdns-06.com.
yamani-japan.com. 5 NS ns-514.awsdns-00.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0