Took me a while to get to this, and some of this probably this won't be news to you, sovay, but: the 1983 Takarazuka performance was based on the telling by Jean Schopfer (writing as Claude Anet), via the Japanese translation Utakata no koi ["a short-lived love"].

I knew about the 1936 film, but not most of the other information. Thank you very much! I wonder how closely the two resemble one another.