Apex domains cannot have CNAME records.
Question and response
Question
dig tmems-jp.trendmicro.com. NS
Answer
tmems-jp.trendmicro.com. 5 NS ns-738.awsdns-28.net.
tmems-jp.trendmicro.com. 5 NS ns-306.awsdns-38.com.
tmems-jp.trendmicro.com. 5 NS ns-1980.awsdns-55.co.uk.
tmems-jp.trendmicro.com. 5 NS ns-1489.awsdns-58.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0