Apex domains cannot have CNAME records.
Question and response
Question
dig qualitia.co.jp. NS
Answer
qualitia.co.jp. 5 NS ns-1916.awsdns-47.co.uk.
qualitia.co.jp. 5 NS ns-1192.awsdns-21.org.
qualitia.co.jp. 5 NS ns-5.awsdns-00.com.
qualitia.co.jp. 5 NS ns-764.awsdns-31.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0