Don't know how many of you follow this series, let alone know about, but its called Gamaran. Basically set during the Middle Edo era; to give you an idea time wise I'd say about roughly 150 years before Himura Kenshin, considering that Kenshin was around towards the end of the Edo era during the Bakumatsu period and beginning of the Meiji era. Gamaran is part of martial arts school called the Ogame School that specialize in swordsmanship and his father is the Legendary 1000 Manslayer. Gamaran's father betrayed the school and nearly killed them all and went off on his own seeking even greater power. There are a shit load of other martial arts schools that specialize in their own respective fighting styles and somehow they all end up fighting each other to find out who is the best. There tons of blood, gore, and fucking awesome action.
“Pirates are evil? The Marines are righteous? These terms have always changed throughout the course of history! Kids who have never seen peace and kids who have never seen war have different values! Those who stand at the top determine what's wrong and what's right! This very place is neutral ground! Justice will prevail, you say? But of course it will! Whoever wins this war becomes justice!”
― Donquixote Doflamingo