第一章：万弥

Wan Mi

Evil spirit + joins Muzan + eats people + no system.

(The protagonist is very bad! Very bad! No humanity, please don't mind if you accidentally enter!)

Manami, who depended on his younger brother for survival, joined the Demon Slayer Corps and became the disciple of Yoriichi Tsugukuni, the most powerful member of the Demon Slayer Corps. However, he failed to kill Muzan during an encounter with him, and thus became a sinner of the Demon Slayer Corps. He was expelled from the Demon Slayer Corps along with his master Yoriichi Tsugukuni.

When he met Muzan again, he had two choices: become a demon and make those who hurt him pay the price, or continue to live like garbage.

Wan Mi chose the former.

Since you have expelled me, I will live my life in the most horrible way possible!

If the Demon Slayer Corps can't tolerate me, then I will become an evil demon!

恶鬼+加入无惨+吃人+无系统。  
（主角很坏！很坏！没有人性，介意误入！）
与弟弟相依为命的万弥加入鬼杀队，成为继国缘一的弟子，鬼杀队最强大的存在，却在一次遭遇无惨的途中没能将无惨杀死，至此成为了鬼杀队的罪人，和师父继国缘一一同被驱逐出鬼杀队。
当他再次与无惨相遇，摆在他面前的有两个选择，成为恶鬼，让那些伤害他的人得到报应，还是继续如同垃圾一样的活着。
万弥选择前者，
既然你们将我驱逐，那我便活成你们最恐怖的模样！
鬼杀队容不得我，那我便成为恶鬼！