Kibutsuji Muzan Has Had Enough

Kibutsuji Muzan was a villain through and through. If other villains had something that could redeem them, he was a complete scumbag. He was vicious-tempered and had little empathy. But that didn't matter. His power was unmatched, and he didn't need to rule through both kindness and force. Fear was the best way to keep his subordinates in line. Apart from the indelible shadow of Tsugikuni Yoriichi, there was no blemish in his life. And even someone as powerful as Tsugikuni Yoriichi was only human. Humans die, so Kibutsuji Muzan hid for decades without a care, only daring to show himself again after Tsugikuni Yoriichi had died. But one day, a familiar figure appeared, as if crawling out of hell, and clutched his sleeve. The familiar earrings swayed in the wind, and he was once again reminded of the terror of being dominated by Tsugikuni Yoriichi. "Don't come near me! Aaaaaaaaaah!!!!" # The female lead is a descendant of Tsugikuni Yoriichi, has perfectly inherited Sun Breathing, and is at the pinnacle of strength # Rather than a Muzan self-insert romance, this is more like relentlessly tormenting the boss # Set twenty years before the original story # Anyway, I had fun Theme: Develop the nation through science and technology