I don’t know, Kamaitachi is usually near the top of the popular geinin rankings - they were 5th in I think the last Wednesday’s Downtown ranking, and the only other young group in the top 5 was Chidori at 3rd. They probably couldn’t book Chidori for it, but Kamaitachi is likely close to an even draw…

They used to have some at the store at NTV Tower, but I’m not sure if it’s easy to check they still do…