Rurouni Kenshin

The anime is about a wandering samurai in the 11th year of the Meiji era (around 1878)who stumbles upon a dojo in Tokyo and decides to stay there, helping in and around it. He protects the weak against the strong with his sword (even when they are banned) and in the process, runs into some friends and enemies from the past. The series also has some characters who really existed in the history of Japan which makes it all the more interesting.