This might be a lot to ask but if the anon who uploads "Ultraman is Crying" book by Hideaki Tsuburaya on internet archive reading this, any chance you had "Ultraman & Copyright - Use of Overseas Rights: Tsuburaya Productions, Sompote, UM. Co" ?
https://www.seizansha.co.jp/ISBN/ISBN978-4-88359-328-6.html