Mashou no Nie

Our protagonist Vincent finds himself wandering around in the forest between two warring nations.His plan: utilize his unparalleled skills with a blade to advance his standing in the world.
After hearing screaming and shouting off in the distance, he dashes over to investigate, only to find the ground littered with corpses clad in Katushan livery.
A group of bandits is advancing upon none other than the Princess Roxana of Katusha.
Realizing that this is the chance of a life time, Vincent draws his sword, cuts down the ruffians, and escorts the princess back to her castle.

Now, Vincent will not hesitate to destroy anyone in his path as he quests for power, glory, and the beautiful members of the royal family of Katusha...