Isekai Samurai

At the end of the Warring States Period, Ginko, the greatest swordswoman of the time, desperately sought a fight to the death with someone stronger than herself. After cutting and cutting and cutting, she finally despairs that there is no one stronger than her in this world, and then she is transferred to another world! And before her eyes - a dragon!

Official raw

English:
Yen Press, MangaPlaza