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Protagonist has the ability to communicate with animals. After saving a black cat's life, it claims it is a monoke. After getting involved in a battle with an enemy, the protagonist loses his life. The cat monoke repays his debt by merging together with him.

A world where people have these special mutations or powers called "quirks". 20% don't have one including the main character- young "Midoriya". He doesn't give up on his dream to become a hero. Just like "ALL MIGHT!"