The “Phantom Nugget Thief” and his son front a new campaign to promote this intriguing “parent-and-child” sauce set.

McDonald’s has been catering to the local market in Japan with a number of exclusive menu items over the years, with customers lining up for limited-edition delights like Full Moon Cheese Tsukimi Burgers and sakura cherry blossom-flavoured McFlurries.

Last year, McDonald’s even offered up an 18-karat gold nugget prize to Chicken McNugget customers and introduced a yellow-suited character called the “Phantom Nugget Thief” as part of the campaign. This year. the Nugget Thief is back again, and now he’s brought his son along for the festivities, with the two joining forces to promote a new “parent-and-child” sauce set featuring the traditional Japanese flavours of wasabi and teriyaki.

Check out the “Phantom Nugget Thief” and his son, “Tiny Phantom Nugget Thief” promoting the new sauce set below:

The Otona Wasabi Mayo (Adult Wasabi Mayo) sauce is said to contain the invigorating taste of Japanese horseradish, mellowed out with a slight sweetness thanks to the addition of mayonnaise. While there’s a slight kick to the sauce that adults will love, it’s mild enough to be enjoyed by children too.

The Wanpaku Teriyaki Mayo (Naughty Teriyaki Mayo) sauce is a combination of creamy mayonnaise and rich, sweet teriyaki flavours. It’s said to be a familiar taste for local customers, as Japanese dishes like shogayaki (grilled pork and ginger) are often served with a mix of soy sauce and mayonnaise toppings.

The new sauce set will be available with any Chicken McNugget purchase during the campaign period, but as an extra special treat, McDonald’s will be selling 15-piece boxes with the two sauces for 390 yen (US$3.57), which is 30 percent cheaper than the usual retail price of 570 yen.

The two new sauces will only be available for a short time, from 26 April to 16 May, which also covers the Golden Week holiday period in Japan; a prime time for parents and children to be enjoying meals together while out and about on short trips around the country.

Source, images: McDonald’s Japan