第1章 夜幕下

Under the cover of night

Natural markings + natural transparency + complete sun breathing = Muzan's new father

(Not a time travel story, the protagonist does not know the plot)

Chiba Yang, whose everything was taken away by the demons, joined the Demon Slayer Corps at the invitation of the Flame Pillar and became the stepson of the Flame Pillar. From then on, all the demons ushered in their nightmare.

The protagonist is a descendant of the Jigoku clan. He looks very similar to Yoriichi. He comprehended the Breathing of the Sun on his own and created his own sword skills.

天生斑纹＋天生通透＋完整日之呼吸=无惨新爹
（非穿越，主角不知道剧情）
被鬼夺走一切的千叶阳在炎柱的邀请下加入了鬼杀队成为炎柱的继子，自此，所有的鬼迎来了他们的噩梦。
主角为继国家族后代，长相与缘一极为相似，自行领悟日之呼吸，自创剑技。