Naruto : Hentai Corruption

Yami Yuumo, an unknown mob character from Naruto's class is given modern knowledge, including the Naruto story. He makes it his mission to rebel against the story ahead and live his life surrounded by female ninjas. Watch as he changes the story of this world and as all the girls in the Naruto world fall deeper and deeper into depravity and corruption... — Description from novelcodex.org