Apex domains cannot have CNAME records.
Question and response
Question
dig haihaimail.jp. NS
Answer
haihaimail.jp. 5 NS ns-1865.awsdns-41.co.uk.
haihaimail.jp. 5 NS ns-313.awsdns-39.com.
haihaimail.jp. 5 NS ns-846.awsdns-41.net.
haihaimail.jp. 5 NS ns-1291.awsdns-33.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0