Marrying Tsunade and Becoming the Strongest Hokage

[System + nearly invincible protagonist + multiple heroines + Tsunade + Hinata + Sakura + Guren + Mei Terumi + Kurotsuchi + Ino + Yugito + Konan] Ye Feng, a modern college student, transmigrates into the body of Itachi Uchiha, whom he had just killed. With only one breath left, he is brought to Konoha Hospital by Sakura and Naruto, who happen to pass by. Tsunade saves his life with everything she's got. He goes on to defeat the Akatsuki, Obito Uchiha, Madara Uchiha, and Kaguya, becoming the strongest Hokage in Konoha's history.