This donut box from Mr. Donut would seem to indicate that they are "the" official sponsor of the Real Madrid soccer team. I wonder why Real Madrid doesn't have Mr. Donut on their jerseys? Seems the English on the box overstates the relationship a bit.

It is also interesting how a soccer sponsorship would be chosen for a donut shop. It is true that soccer balls and donuts are both round, but still... Probably just an excuse or cheaper way to get a picture of the Beckham, ever so popular in Japan, on the box.