Sequence Advent: My Undead Editor

The story takes place in a parallel world called "Blue Star". Hundreds of years ago, the "Abyss Rift", a space rift, appeared around the world. Alien monsters called "dirty demons" poured in, and human civilization was on the verge of collapse. At the same time, a regular power called "Sequence" comes, and all young people over the age of 18 can perform the "Spirit Enlightenment Ceremony" to awaken their own professional "Sequence". This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.