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Gyutaro and Daki/Ume are so " I regret nothing but you " & " I regret everything but you " trope.
Rewatching season 2 and I took note on how Gyutaro is so sure that in any lifetime that he'll be in, he'll choose the path of taking because he believes himself to be filthy and bad to the core, that it doesn't matter how many times it happens, that will always be his choice.
Tearing my hair out of how he only chooses love when it comes to Daki/Ume. He chose to be vulnerable only to her, his little sister. He lets her see how ugly he and the world is, but he wouldn't allow the ugliness to drown her happiness like it did with his. He was never given care since he was born, and he refused to have his sister being treated the same.
Daki/Ume becoming what and who she is because of him... he's her whole world. Her brother, her parental figure. At some point she probably figured out how her beauty could have had her having a better life on her own, but she chose to stay with him regardless of what happened. Just as Gyutaro chose to love her, Daki/Ume chose him as well.