Happening upon an underground lab near Nami no Kuni, Naruto returns during the Chuunin Exams month for training, and opens a whole world of possibilities, gifted with the knowledge and genius of Kurotsuchi Mayuri, and all the wonderful things he left in the lab in observing the Elemental Nations, as well as the truth of Konoha... Evil!Konoha, Sandaime Genius!Vengeful!Narutox harem