Apocalyptic Mountains and Seas: I'm Really So Excited!

[Overpowered Teammates + Post-Apocalypse + Primordial Legends + Supernatural Invasion + Monsters from the Classic of Mountains and Seas + Cultural Legacy + Ideals and Convictions]

A boy who jumped off a building somehow found himself in a world where people preyed on one another, a place nestled between mountains and seas and plagued by one bizarre incident after another.

As strange events continued to unfold, the boy’s memories grew increasingly muddled. Had he transmigrated, or was he still lost in a dream, never having woken up?

Which world was real?

<A tsunami comes once every two years? I’ll split it apart!>

<You can only cross the passes one at a time? Then what am I doing here?>

<There are incredibly powerful creatures on the ocean floor! Are they tasty?>

<Why can’t I cultivate spiritual power? But when you get excited, you have a strange power!>

[Only by eating him can you keep everything here!]

[Do you believe that humans can triumph over fate?]

[Will humanity’s fate really end here?]

[I just want to lie flat and slack off. That doesn’t mean I’m actually the sort of person who lies flat and slacks off! ...What a joke! In my own world, I was the king of the rat race under nine years of compulsory education!]

Aha... Ahahaha... I’m so excited!!!