Apex domains cannot have CNAME records.
Question and response
Question
dig Kamome.Or.Jp. NS
Answer
Kamome.Or.Jp. 5 NS dns1.Kamome.Or.Jp.
Kamome.Or.Jp. 5 NS dns3.Kamome.Or.Jp.
Kamome.Or.Jp. 5 NS dns2.Kamome.Or.Jp.
Authority
The response has no authority records.
Additional
dns1.kamome.or.jp. 5 A 218.45.16.69
dns2.kamome.or.jp. 5 A 218.45.29.109
dns3.kamome.or.jp. 5 A 15.168.4.91
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0