これ併用すると実質2万円の70%引きで解釈であってる？
https://cdn.demae-can.com/files/img/campaign/bCUWvpSV/sp/top_579_10000cp201806_sp_20180604_20180617.gif
https://cdn.demae-can.com/files/img/campaign/IKYAtyIC/sp/top_3_1_pointback_sp_20171201_forever.jpg