Naruto: Many Children, Many Blessings, Create the Strongest Ninja Clan

[System, fandom, farming, shady, decisive killing, invincible] He traveled through time and became an elder of the Uchiha clan, but the time was one year before the night of the genocide! At this time, Shisui had just died, Itachi was already a young boy at this age, Fugaku was indecisive, and Danzo was busy sharpening his sword.  The countdown to genocide begins, and Uchiha Natsuhiko awakens [Many Children, Many Blessings·The Strongest Family System].  As long as you marry a wife and have children, increase your family's population through reproduction, and improve your clan's strength, you will receive heaven-defying rewards! Bite! Marry an elite Uchiha kunoichi and get a reward: a fairy body (beginner level)! [Ding! The first S-level qualified heir is born, reward: 10% progress in opening the Samsara Eye! [Ding! The number of jounin in the family exceeds 100, and the reward is: a sacred tree sapling! Facing the aggressive Konoha senior officials and the coming night of genocide. Natsuhiko slapped away Uchiha Itachi who was brainwashing the tribe: "What is the will of fire? The family is gone, what else does the village need?" Danzo: "I regret it, Natsuhiko is the greatest darkness in the ninja world!" Obito: "Are you crazy? I just want to create an infinite Tsukuyomi, and Uchiha Natsuhiko brings hundreds of Susanoos to attack me?" Madara: "Natsuhiko, you are the savior of Uchiha. I will give you the position of clan leader. I also want to join your family..." Starting from the rectification of Uchiha, in this cruel ninja world, Natsuhiko wants to create an eternal imperial clan spanning the starry sky!