Demon Slayer: We Promised to Protect You, but You Took the First Step

There is no time travel, and the protagonist does not know the plot. Based on the original work, some plots are added and modified, and some new characters are added. I was born with clear markings, but it's a pity that I can't learn the breathing method (it takes time), so I can't become a happy father. The early development is similar to the original game, but some parts will be changed. I will make up for my elder brother's regrets. Because new characters have been added, the combat power of ghosts will be appropriately increased, and new ghosts will appear.