Nexus: Light Is a Bond That Strangles Generation After Generation

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Nexus + the only Deunamist + no heroine + Ultraman derivative fanfic + no Ultraman world setting + hellish dungeon arcs

Chen Yi, who has lived in a pessimistic world since childhood, accidentally becomes a Deunamist.

Can a pessimistic boy understand the meaning of this light?

I've done all I can with the synopsis. Please read the story itself.