Well, good for all parties involved, and I hope it works well.
Behind my comment was that schools from the US opening campuses of some kind here was happening back then--later 80s and into the 90s. Perhaps not in Tokyo, but several satellite campuses were set up by different schools. I think (seem to have heard?) that most were later closed, or maybe taken over by a local gov't or something.
Similar partnerships (or whatever the formal business establishment/relations might be) are even more common in China, and I know that RMIT has a couple campuses in Vietnam.
Not sure of the business reasons behind it, but sister school "relationships" are far more common. Where I worked, they started with one, and later had a couple dozen choices. I acted as escort/chauffeur for groups on shorter trips--a couple month-long trips to New Zealand, also shorter ones to Adelaide. (I avoided choosing US locations, also UK, which was expensive even then--the per diem for an escort was far less than the minimum needed.)