The Two Of Us

Kurogami Clan was murdered 3 years ago by assassins employed by their rival clan. However, the assassins make one big mistake, that is they did not kill Kurogami Kazuo because he was away from home the tragedy happened. Kurogami Kazuo, the second son of Kurogami Head Clan and also the strongest among them. When Kazuo got home, he saw his family corpses one by one without shedding even a drop of tear. Not because he did not love his family but its the opposite. He love them as they are his whole world, the only reason for being born in this world. The indescribable feeling of lost, anger, sadness and hopelessness make his heart and emotion frozen. Then, when he heard a small cry from his 3 years old little sister that still alive he rushed to her and calm he down. He immediately took her to the nearest hospital. While his sister in hospital, he seek his revenge to the assassins and his rival clan. With his family blood mixed with the Yakuza and Youkai (Demon) blood. He massacred all clan and assassin members.

Now, after 3 years has passed. The only family he have now is his blind little sister Kurogami Hikari and he vowed to protect her even if he need to turn the world into his enemy.