Apex domains cannot have CNAME records.
Question and response
Question
dig phishme.jp. NS
Answer
phishme.jp. 5 NS ns-1439.awsdns-51.org.
phishme.jp. 5 NS ns-813.awsdns-37.net.
phishme.jp. 5 NS ns-430.awsdns-53.com.
phishme.jp. 5 NS ns-1619.awsdns-10.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0