Naruto System in One Piece - Chapter 420

A protagonist reborn in another world.

"When will people understand.... I'm only half insane?"

“Doctor, it seems there’s something wrong with my emotions.”

“There’s a clown in the West City circus who can make everyone laugh. I think he can certainly help you.”

“But Doctor… I am that clown.”

“…”

……

Waking up in a strange room,

Leonard Churchill finds himself lying next to a stunning woman.

Assuming good fortune has come knocking,

but the eerie part is, she’s a corpse without any heartbeat or breath.

Just when he thinks he’s been roped into a bizarre murder scene,

After a closer inspection,

He realizes,

Shockingly, she isn’t human!

This is a fantastical world after the Great Catastrophe, under the fog-covered land lies countless Underground Cities left by the ancients.

A Treasure Hunter wearing a clown mask travels alone in the dark.

He is Joker Leonard Churchill, the Catastrophe King!

……………………………………………………………

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The prospective college student Luo Ji, who is enjoying the last summer of the third year of high school, has undergone earth-shaking changes at this moment after accepting the invitation of the game friend and becoming the player of the game of “Civilization Rise”.
This is a war game between the world and the world, and it is a fierce collision between civilization and civilization!
To annex the five continents, sweeping across the three oceans, and see how Luo Ji led his people, in this powerful enemy look around, the battlefield of the heroes to fight for a battle to the most powerful imperial civilization!

- Description from uukanshu translation