Apex domains cannot have CNAME records.
Question and response
Question
dig broadcenter.jp. NS
Answer
broadcenter.jp. 5 NS ns014-i5am855t9prrlflt.i.d-53.net.
broadcenter.jp. 5 NS ns014-i5am855t9prrlflt.i.d-53.jp.
broadcenter.jp. 5 NS ns014-i5am855t9prrlflt.i.d-53.info.
Authority
The response has no authority records.
Additional
ns014-i5am855t9prrlflt.i.d-53.jp. 1 A 162.159.26.59
ns014-i5am855t9prrlflt.i.d-53.jp. 1 A 162.159.27.103
ns014-i5am855t9prrlflt.i.d-53.jp. 1 A 203.180.146.105
ns014-i5am855t9prrlflt.i.d-53.net. 1 A 210.138.20.105
ns014-i5am855t9prrlflt.i.d-53.info. 1 A 202.32.219.45
ns014-i5am855t9prrlflt.i.d-53.jp. 1 AAAA 2001:240:bb81:0:0:0:29:1105
ns014-i5am855t9prrlflt.i.d-53.jp. 1 AAAA 2400:cb00:2049:1:0:0:a29f:1a3b
ns014-i5am855t9prrlflt.i.d-53.jp. 1 AAAA 2400:cb00:2049:1:0:0:a29f:1b67
ns014-i5am855t9prrlflt.i.d-53.net. 1 AAAA 2001:240:bb81:0:0:0:29:105
ns014-i5am855t9prrlflt.i.d-53.info. 1 AAAA 2001:240:bb81:0:0:0:28:45
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0