Demon Slayer: Flowers in the Clouds, Dance of Butterflies

(To make up for regrets + the heroine Butterfly Sisters + knowing the plot (but not much) + more daily life + one step at a time + no system + self-created breathing + self-created plot) The protagonist Ruri Unrin has been considered an unknown child since birth, and has lived a dark life for five years. Just when she thought it was finally over in the last year, something unexpected happened. On her birthday, her favorite relative passed away, and her life became even darker. Just when he thought that such days would last forever, the gentle smile of Butterfly Kanae and the tenacity of Butterfly Ninja became the only salvation in Yun Rin's heart. By chance, he was reborn into the world of Demon Slayer, and decided to become stronger to save the Butterfly sisters. He used the unfamiliar plot and the knowledge of the original world to make up for his regrets and change the ending.