absolutely impossible to unsee the Utena of it all now that you have said it but! do you really think the book thinks of itself as a tragedy? not that I disagree that Regret(TM) is a major component, but idk that I'd use the word tragedy without, hmm, a sense that things Could/Should have turned out differently than they did, whereas I think the book believes pretty firmly that they Couldn't/Shouldn't.