There were four Ronin Kenshin anime series. They were: 1 Ronin Kenshin: It was produced by the Japanese animation company JCSTAFF and released in 1996. This animation was the first and most famous version of Ronin Sword Heart. 2. Remembrance of Ronin Kenshin: It was produced by the Japanese animation company, Axis, and released in 2003. This anime was a sequel to Ronin Kenshin, and it depicted the relationship between the main character, Dragonfly Ishijima, and the main character, Kenshin. 3. Ronin Kenshin the Great Swordsman: It was produced by the Japanese animation company Shaft and released in 2008. The animation was a derivative work of Ronin Kenshin. It told the story of the protagonist, Dragonfly Ishijima, joining the organization of the Great Swordsmen. 4. Ronin Kenshin Renewed Swordsman: It was produced by the Japanese animation company Shaft and released in 2017. The animation was a derivative work of Ronin Kenshin. It told the story of the protagonist, Shidao Dragonfly, who traveled to the modern world and became a new swordsman.