Apex domains cannot have CNAME records.
Question and response
Question
dig magma.ad.jp. NS
Answer
magma.ad.jp. 4 NS spa.magma.ad.jp.
magma.ad.jp. 4 NS tdns.magma.ad.jp.
magma.ad.jp. 4 NS x1turbo.ims.jp.
magma.ad.jp. 4 NS milkroad.magma.ad.jp.
magma.ad.jp. 4 NS yatsutdns.magma.ad.jp.
Authority
The response has no authority records.
Additional
x1turbo.ims.jp. 4 A 202.210.190.99
milkroad.magma.ad.jp. 4 A 219.101.80.32
yatsutdns.magma.ad.jp. 4 A 210.238.57.14
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0