Naruto: I Woke Up as the Third Hokage

Konoha, Year 41. The Second Great Ninja War has only just ended, yet peace is nowhere to be found. Reborn as the Third Hokage, Sarutobi Hiruzen must guide a fractured village through internal strife and external threats, armed with a mysterious system that measures authority, diplomacy, military strength, economy, and education. From reclaiming Orochimaru to uniting rival clans, from political reform to technological advancement, this is the story of a Hokage who refuses to let Konoha decline. Konoha will not stagnate. It will accelerate. .... — Description from novelcodex.org