ns2.elmc.co.jp has no CNAME records.
Question and response
Question
dig ns2.elmc.co.jp. NS
Answer
The response has no answer records.
Authority
elmc.co.jp. 46 SOA ns.elmc.co.jp. root.elmc.co.jp. 2025121701 10800 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0