 If you liked
Basara
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 ...then you might like
Sengoku Blood: Bara no Keiyaku
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In both:
- Heroine grew up in the shadow of her twin brother who was the "chosen one" and so she was ignored by the villagers and only got along with her twin and her guardian.
- Heroine replaces her deceased twin brother, assumes his identity and becomes the leader of a war/revolution.