Several7s
Naoki hates his clan. His leader killed his parents and stole him from home to because a Samurai at a young age, but he remembered it all and when his chance came, he ran away from home and hid with the ninjas, training with them and living as a Ronin, or wandering Samurai.
But war has come to the clans and Naoki knows he can't just sit out this time. Nobunaga Oda is fighting to take over all of Japan and Naoki doesn't want to let that happen. Oda is too cruel and doesn't have any regard for human life. If he were to take over and win, Japan would be ruled by a tyrant.
Naoki's fix for this was to take over his clan and use it to fight against Oda, but when Oda attacks his clan and kills his people without mercy, Naoki has had enough. To protect his people, he will fight to help another clan take over Japan. His ultimate goal, however, is to end the war as soon as possible so he can go back to the ninjas and live his life in peace.
*Warning: Some scenes in this book get graphic about describing death. If you dislike or won't read that kind of thing, this book might not be for you.