Naruto : The White Lightning Reincarnator

Kamishiro Hagoromo won the reincarnation lottery: a blessed face, a genius mind, and a killer Lightning Release. His dream? A peaceful, easy life in a romantic comedy. The universe had other plans. It dropped him into the Third Shinobi War and assigned him to its most volatile, forbidden asset: Uzumaki Kushina, the Red-Hot Habanero and Konoha's living secret weapon. Now, trapped between a teacher who treats him as her personal entertainment and a battlefield that chews up prodigies for breakfast, Hagoromo must use every cheat he knows. His goal isn't to become Hokage, or a legend. It’s to make it to the front lines alive. The greatest threat to his mission, however, isn't the enemy—it's the teacher who's supposed to prepare him for it. — Description from novelcodex.org