Apex domains cannot have CNAME records.
Question and response
Question
dig crmf.jp. NS
Answer
crmf.jp. 5 NS ns-1188.awsdns-20.org.
crmf.jp. 5 NS ns-1869.awsdns-41.co.uk.
crmf.jp. 5 NS ns-349.awsdns-43.com.
crmf.jp. 5 NS ns-917.awsdns-50.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0