Demon Slayer: From the Start, I Was Rewarded Hinokami Kagura

(Demon Slayer + a mischievous System + slaying all Twelve Kizuki + not mindless power fantasy + minor changes) [Hinokami Kagura] [Sun Breathing] [Single heroine: Shinobu Kocho] [Making up for past regrets] [The Tenth Pillar] Jiang Huai was a man of the new century, but one day, while eating instant noodles, he choked on them and died. Fortunately, he was chosen by a mysterious System and given a choice of three worlds. Afraid of dying, Jiang Huai chose the world of Demon Slayer. As soon as he arrived, Jiang Huai used Sun Breathing's First Form: Dance! He successfully killed his first demon. He also became a fellow disciple of Tanjiro and Giyu Tomioka! When he joined the Demon Slayer Corps for the first time, Shinobu Kocho carried him back to the Butterfly Mansion. Jiang Huai displayed his formidable strength by killing Rui, Lower Rank Five! He became the Demon Slayer Corps' tenth Pillar, the Scenery Pillar! Jiang Huai kept pushing the story forward and gradually opened Shinobu Kocho's heart, allowing her to truly become an eighteen-year-old girl again. But then a special red moon appeared, granting demons a massive boost. For the first time, Jiang Huai felt the pressure, and he began actively hunting down the Twelve Kizuki when they were alone. With the power of Amenonaka, he was invincible! Doma fled in terror, Akaza was nearly beaten to death, and Muzan flew into a rage. And it was all because of Jiang Huai!