I don't know that I agree with that. I think the reality of a period piece is more nuanced than that. Also we are talking about a personal choice Kamoko is making which is informed by her own life experience. I don't think the author made a wrong choice here. I think you could write it either way. The ending does imply a much darker mindset for Kamoko, but Kamoko wasn't really portrayed as a bright and cheerful character at any point in this continuity.
I think we as people of modern morals want her to make the other choice desperately. Who knows. Maybe she does. Though those words don't leave us much room to wiggle on the outcome.
Edited by phillos