After Becoming Hokage, I Reorganize the Ninja World

Transmigrating into the Naruto world through three ninja wars, Asuka Yota just wants to stay alive—but the universe won't let him. Then the "Grind System" kicks in. "Clone Jutsu → Water Clone → Shadow Clone → Sage Clone" "Substitution Jutsu → ? Clone Substitution → Orochimaru-style Substitution → Amenotejikara"... "Kakashi, aside from eating and sleeping, I've been grinding skills nonstop. Think I'll survive the Third War?" "Asuma, you don't mind if Kurenai marries me, right?" "Third Hokage, you want me to be the Fifth? I'll think about it."