Apex domains cannot have CNAME records.
Question and response
Question
dig shop-pro.jp. NS
Answer
shop-pro.jp. 5 NS dns3.shop-pro.jp.
shop-pro.jp. 5 NS dns1.shop-pro.jp.
shop-pro.jp. 5 NS dns2.shop-pro.jp.
shop-pro.jp. 5 NS dns4.shop-pro.jp.
Authority
The response has no authority records.
Additional
dns1.shop-pro.jp. 5 A 54.150.22.30
dns2.shop-pro.jp. 5 A 13.113.96.19
dns3.shop-pro.jp. 5 A 54.65.155.144
dns4.shop-pro.jp. 5 A 18.182.111.30
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0