Oh I'm sure he had his hands in it somehow. Loland this song wasn't produced by tsunku!!! well the CD label didn't say so...yayyy no tsunku singing background~~but the disc is 'not for sale'... ><' maybe that's y we all got the cd cover images and cd label all in digital form?
It was probably "released" as a give-away during some of those events you can see on that Nissen homepage. They handed out flyers, balloons and stuff as well. The whole thing I guess was a promotional tool for Nissen. Pretty elaborate though with the Zeppelin, but then it's the biggest mail-order company there is in Japan if I'm correct.