Toaru Majutsu no Index SS - Volume 1, Epilogue: A Single Will and a Small Key. The_Present_Target.

From brewing whiskey out of car tires to brewing immortal potions just because they are tasty.Regressed from a world where the only issue technology failed to solve was boredom, Theo, an adept nanomancer and master brewer, finds himself in the literal shoes of magic academy's trash teacher.Cultivation? Magic? Martial arts? Craftsmanship?No.Now is the time for this world's first Nanomancer to rise and establish alchemy as the fifth great subject for others to follow!

When Caesar learned that he had traveled to the world of pirates!

In order to become stronger, I started hell-style training, looking forward to going to sea one day,

Stir up the situation and rule the world!

One day, a pirate group came.

Looking at the familiar figures behind the captain,

Caesar instantly knew his name – Lockes!

After the Island of the Gods incident…

Garp: When did a Caesar appear in the Rocks Pirates? Almost fell into his hands!

Roger: What kind of strange ability is this? Domineering! ?

White Beard: The scars on my body are thanks to Caesar!

Golden Lion: How is it possible! What ability is he hiding! ?

Kaido: Bastard, it turns out that this guy has been paddling all the time!

- Description from novelbuddy

When the average man is suddenly thrown into a video game as an extra, fated to die, they might first think to hide or run away. But not Luka. A man now inhabiting the body, he simply wants to survive - no matter the cost - even if it means he has to kill the main character!

After a reality-shattering event puts him in a two-year coma, Rin Matsuda wakes up to a world straight out of a video game. Dungeons, monsters, and super-powered “Hunters” are the new norm.While his best friend has become a famous lightning-wielding hero, Rin awakens with a glitched and bug-ridden power—the “Fractured System.” To level up, he can't just kill monsters; he must hunt reality-bending “anomalies” and survive deadly trials with a ridiculously high chance of death. Seen as an error by his own system and unawakened by the world, Rin must embrace his broken abilities to survive.