dns.arai-dd.com has no CNAME records.
Question and response
Question
dig dns.arai-dd.com. NS
Answer
The response has no answer records.
Authority
arai-dd.com. 2057 SOA dns.arai-dd.com. hostmaster.arai-dd.com. 1745934490 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0