In a Crossover World, I Get Stronger by Eating Myself

After transmigrating, Luo Zhen had neither a System nor a mysterious old mentor. Just as reality was grinding him down and he was feeling helpless about life in another world, he saw other versions of himself in an unknown space.

The good news: the cheat had arrived. He could transmigrate to multiple worlds at once and gain the abilities of his other selves.

The bad news: he gained far too much. Even his very existence was taken away!

A story about how my golden finger, which was supposed to be the “we're a loving family” type, turned into a battle royale where only one can survive.

(DanMachi -> Konosuba -> Campione! -> Konosuba -> Digimon)