Naruto: Manipulation Novel

Five years into Konoha's history, the titanic battle between Hashirama Senju and Madara Uchiha concludes at the Valley of the End. With his brother facing death from mortal wounds, Tobirama Senju executes an unthinkable act—summoning Emiya Shigen, a forgotten medical ninja from ancient times, whose legendary skills may be Hashirama's only salvation.