Apex domains cannot have CNAME records.
Question and response
Question
dig oneoffice.jp. NS
Answer
oneoffice.jp. 5 NS ns004-o2qn76hhr4q3q5aj.o.d-53.jp.
oneoffice.jp. 5 NS ns004-o2qn76hhr4q3q5aj.o.d-53.info.
oneoffice.jp. 5 NS ns004-o2qn76hhr4q3q5aj.o.d-53.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0