Black Soy beans covered in white chocolate mixed with roasted soy bean powder.
Participants in the 2010 Shikaoi Trail Run were allowed to choose from these chocolates or a free hot spring bath as a finisher's prize. I got the chocolates! They were yummy. They didn't last long. They are roasted soy beans covered with white chocolate that has soy bean powder (kinako) mixed in. They are from a local confectionary called Ryugetsu. If you want to find them they are called Kinachoko Kurodaizu. (きなチョコ黒大豆).