One Piece: I Just Want to Lie Flat With the System for Overachievers

[Pirate King + Marines + plot-driven + coming-of-age + multiple heroines, not a harem protagonist + grindset System + lie flat]

Ren, a legendary workaholic, transmigrates into the world of pirates and gains a grindset System.

After spending his whole life working himself to the bone, Ren doesn't want to exhaust himself all over again. In this life, he just wants to lie flat.

But fate has other plans.

First, Garp forcibly takes him on as a disciple.

Then the Marines pour all kinds of resources into training him.

And on top of that, Marine leaders like Zephyr, Sengoku, Akainu, and Aokiji place their eager hopes in him.

After finally managing to hide out at Marine Branch 16 in the East Blue for a few quiet years, the Paramount War breaks out.

The cowardly pirate king Ren trained still has his bleeding-heart tendencies and wants to let the pirates go home.

Ren: “That's it, I can't take this anymore. Today, I'm cleaning house!”

Ren: “And another thing! If no one is going to let me live in peace, then no one gets to live in peace!”

Ren: “Celestial Dragons! Yes, I'm talking about you! Stick your head under my sword!”