Check for miyukidou promo code exclusions. miyukidoupromo codes sometimes have exceptions on certain categories or brands.
These offers are usually only available for part of the day because they're considered exceptionally good, but lately miyukidou has been offering it all day long
Look for the blue "site-wide" label for site-wide miyukidou promo codes. Site-wide codes can be applied to any item on miyukidou website, and therefore are the most useful codes.