The Strange Adventure of the Devil and the Savior

The former Demon King, who served as the ultimate BOSS in many worlds and was only one step away from destroying the world every time, woke up and traveled through time. This world full of ninjas has order, but not much. The most important thing is that it is in endless war. It is a good place to get back to the old business! As long as I resume my role as the villain and get those caught up in the war to cooperate and deal with the outside world, I can end the war and select the person best suited to lead this world. The former Demon King, Reincarnated Uchiha, Seal Fire thought so. Then, when he stepped out of his house, he saw that across a river lived his childhood sweetheart, the savior of humanity, and the safety valve of the devil... Fujimaru Ritsuka. Oh no, now it's Senju Ritsuka. ... Perhaps, this villain's plan can be more detailed. ☆The previous work: "I Rely on the Vest to Be the Villain BOSS" is related but not that much. The protagonist is a candidate for Beast. CP Gudajun. Purpose: Contact the essence through appearance