Fics like Mem̶e̶n̶t̶o̶ mori.

Ray Chiu awakens to find himself trapped in the world of Gravity Falls—the animation his sister loved to watch. With just a vague recollection of its themes and the promise of a happy ending, he chooses seclusion, spending his summer vacation cloistered in his room, studying in peace. And one day, the world collapsed. The time died, and every meaning had no meaning. Left alone in the decaying world, Ray is inexplicably granted one last chance to unearth his purpose, the world's grim end rewriting itself from the beginning. Now he needs to step up to the world, whether he likes it or not...just to survive. -This is motivated by a Korean Novel, 괴담 동아리. You don't have to read the story to understand this though.

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