Apex domains cannot have CNAME records.
Question and response
Question
dig 192-255.24.222.202.in-addr.arpa. NS
Answer
192-255.24.222.202.in-addr.arpa. 4 NS dns2.ymir.co.jp.
192-255.24.222.202.in-addr.arpa. 4 NS dns1.ymir.co.jp.
Authority
The response has no authority records.
Additional
dns1.ymir.co.jp. 4 A 59.106.32.195
dns2.ymir.co.jp. 4 A 158.201.243.74
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0