Apex domains cannot have CNAME records.
Question and response
Question
dig scorpio.oneoffice.jp. NS
Answer
scorpio.oneoffice.jp. 5 NS ns005-ovpkmcrmqh46ab2l.o.d-53.info.
scorpio.oneoffice.jp. 5 NS ns005-ovpkmcrmqh46ab2l.o.d-53.jp.
scorpio.oneoffice.jp. 5 NS ns005-ovpkmcrmqh46ab2l.o.d-53.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0