Soy Sauce for Ice Cream

I love Japanese sweets. One of my favorites is mitarashi dango, round rice dumplings on a stick covered with a sticky, sweet and salty syrup. The base ingredient of that syrup is soy sauce. I always wanted to use that syrup for pouring on top of ice cream, since it is similar to caramel. Well, I found out recently that there already is a company out there selling soy sauce for ice cream. It's got a very original name: "Aisu-kurimu ni kakeru shoyu" (loosely translated, "Soy Sauce for Pouring Over Ice Cream"). I haven't found it on the shelves of the local supermarket, so I might either have to order it online or do what I originally was planning on doing, making my own. Additionally, I found some other interesting recipes in English from the official Kikkoman site, including this one for Green Tea and Soy Sauce Ice Cream.