Enemies From the Heavens? I'm the Protagonist, So I'm Invincible!

[This isn’t a pure invincibility story, so apologies to readers who came for the popular tropes. The publisher won’t let me change the title after signing, so the author is waiting until the book reaches 200,000 words to test a new title.]

An adoptive father with a mysterious identity, fantastical objects of unknown purpose, a white-haired girl he picked up just as his travels began...

Pachio always thought he was supposed to be the protagonist of this era in another world.

That was, until a long crack tore across the sky and demons began to invade...