Apex domains cannot have CNAME records.
Question and response
Question
dig neweb.ne.jp. NS
Answer
neweb.ne.jp. 4 NS dns10.dion.ne.jp.
neweb.ne.jp. 4 NS ns3.neweb.ne.jp.
neweb.ne.jp. 4 NS ns1.neweb.ne.jp.
neweb.ne.jp. 4 NS ns2.neweb.ne.jp.
Authority
The response has no authority records.
Additional
ns1.neweb.ne.jp. 4 A 203.140.129.2
ns2.neweb.ne.jp. 4 A 203.140.129.3
ns3.neweb.ne.jp. 4 A 203.140.129.4
dns10.dion.ne.jp. 4 A 211.5.1.217
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0