Demon Slayer: The Wolverine Template

Takeo Minamoto had transmigrated.
He crawled out of a grave, reborn as a boy named Kamado Takeo.

Then he learned—this world has demons.
And not just that... it's an anime world. One he’s never even seen before.

Ugh... I scrimped and saved, just to buy a massive TV—and for what? I binge-watched Avengers, Inception, Loki, The Wolf of Wall Street, and every goddamn Nolan mind-bender out there. And now you're telling me I should've watched anime instead? Yeah—Fuck you too, God!

And then...

He started seeing a familiar figure in his dreams?

Takeo: "Can someone explain to me why Wolverine is in my dreams? And not just any Wolverine—Old Man Logan?"

Wait, are you saying… if I earn his recognition, I can gain his powers??

After realizing this, the way Takeo looked at Logan changed entirely.

Old Man Logan from Logan, 2B from NieR: Automata, the Wolf from Sekiro, Hide from Nioh, who defeated Otakemaru...

By gaining the approval of powerful characters from different worlds and inheriting their abilities, Takeo gradually grows into a protector strong enough to guard everything.

And so...

This story begins with a boy who climbed out of his own grave.