Heroes of Might and Magic: The Knight

Li Cha is reborn in another world as the heir to a minor noble family. At least he doesn't have to start with nothing. But this world seems dangerous. Giants threaten from the north, sea folk from the south, and beastmen are pressing in relentlessly. Humanity is far from powerful. Fortunately, Li Cha has the Heroes of Might and Magic System, giving him the power to take control of his own fate.