I'm the Hero, so why do I have a Villain System!? - Chapter 25: Chatterbox

Young clerk Loya crossed and came to the world of the legendary OP. As a traversal party, he naturally had golden fingers, but his golden fingers turned out to be the dragon annihilator system from the demon tail!

Is still the ice dragon dragon wizard!

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What interesting chemical reactions occur when two worlds with completely different power systems touch together?

When the laser of the ape meets the roar of the ice dragon, what will it look like?
When the green pheasant saw the mouth of the dysentery being eaten by a mouthful, what kind of stunned?

“If it wasn’t for fear of becoming a dragon, I would have unified the world!” Said Loya.
“Don’t you dare say that you are seasick?” Carp buttoned his nostrils and smiled dismissively.

- Description from Uukanshu

Every villain is scripted to die. Kael Voss was the hero who always won—until death flipped the board.He wakes in the body of the first boss he ever killed: a shadow lord doomed to fall in chapter one, forgotten fodder for the chosen one.No more playing nice.With perfect game knowledge and the forbidden Shadow Sovereign System, Kael turns the script inside out. The “hero” who slaughtered him? Now prey. The gods who wrote his fate? Blind to the rewrite.He schemes from the dark, grows stronger in silence, and carves his own ending.The light thinks it’s destined to win.Kael knows better.One shadow against the entire story.This time, the villain finishes what he started.(Drop a power stone if you want the villain to win big!)

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. After hiding his strength and living the mediocre life of a mob character by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only playing at being a power in the shadows, his misunderstanding subordinates, and a giant organization in the shadows that gets trampled…. This is the story of a young boy who had adored powers in shadows possibly eventually reigning over the world of shadows in another world.

On a certain day, a certain thought came to Japan’s Sun Goddess. ——Aren’t there too many Japanese people being abducted to other worlds? It’s true that the large majority of Japanese are diligent and docile and soft-hearted, which makes them pretty much the best people to ask for favors. “But recently it’s just gotten way too out of hand…… Oh, I’ve got it! Whenever a Japanese person is summoned, I just have to summon an otherworlder!” And now, every time a Japanese person is summoned, princesses and elves and beastmen and whatnot are reverse-summoned. Under the acknowledgement of the government, they begin living in Japan. Today, too, Japan is at peace. And so begins this laidback isekai cultural exchange story♪