Looking for this manga

The story is basically in old japan, you know samurai eras and stuff, The mc and his brother are trying to survive I think? Its pretty dark and they don't shy away from being explicit, I remember, there was an arc where they became prisoners and the mc and his brother were put on different cells, the brother was put on a all women cell, and kinda got raped women of all ages. The mc was put on a duel with a heir of samurai blah blah and won, he became the heir and then learned the qau of the sword and stuff, with his brother. They grew up and was to set off on a journey, I dunno why but was accompanied by a female shinobi and 1 more person. And that's all I remember.