The Demon King and the Savior's Curious Adventure

A former Demon King who had served as the ultimate BOSS in multiple worlds and come within one step of destroying each one transmigrates after waking up one day.

This world, full of ninjas, has some order, but not much. More importantly, it is embroiled in endless war. It is the perfect place to return to his old line of work!

If I take up the role of the great villain again and get the warring factions to cooperate against a common enemy, I can end the war and, while I'm at it, choose the person best suited to lead this world. So thought the former Demon King, now reincarnated as the Uchiha Fenghuo.

Then he stepped out of his house and saw that, just across the river, lived his childhood friend from his previous life, the savior of humanity, the Demon King's safety valve... Fujimaru Ritsuka.

Oh no, she's Senju Ritsuka now.

...Maybe this villainous plan needs a little more fine-tuning.

☆ Related to the previous work, I Become the Villainous BOSS Through My Secret Identities, but not all that much.

The protagonist is a candidate for beasthood. Pairing: Gudako.

Theme: Look beyond appearances to reach the truth.