Yasuke - Review - Anime News Network
Synopsis: Yasuke follows the titular Black samurai Yasuke, a man who was once known as Eusebio Ibrahimo Baloi, a Yao man that most likely hailed from Mozambique. Raised as a Yao servant, Eusebio eventually becomes not only a samurai, but also a right-hand man and trusted confidant to one of Japan's most notable historical figures, Lord Oda Nobunaga. Yasuke is also the story of Yassan, a day-drinking ronin who, in the wake of his Lord's very untimely death and the defeat of Nobunaga's army, leaves life as a samurai and becomes a boatman…until destiny comes calling in the form of a mothe...
Source: animenewsnetwork.com