Apex domains cannot have CNAME records.
Question and response
Question
dig rakurakuseisan.jp. NS
Answer
rakurakuseisan.jp. 5 NS ns-848.awsdns-42.net.
rakurakuseisan.jp. 5 NS ns-1121.awsdns-12.org.
rakurakuseisan.jp. 5 NS ns-1629.awsdns-11.co.uk.
rakurakuseisan.jp. 5 NS ns-215.awsdns-26.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0