Apex domains cannot have CNAME records.
Question and response
Question
dig tsukijiharumi.com. NS
Answer
tsukijiharumi.com. 5 NS ns-1684.awsdns-18.co.uk.
tsukijiharumi.com. 5 NS ns-1716.awsdns-22.co.uk.
tsukijiharumi.com. 5 NS ns-427.awsdns-53.com.
tsukijiharumi.com. 5 NS ns-799.awsdns-35.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0