One Planet for Everyone! Building Science and Technology Civilization at the Beginning - Chapter 394

Crossing into the world of Naruto, and acquiring the One Piece system, with all the powers of the world of One Piece, swordsmanship, devil fruit, domineering.

-Do you think that your fire is very powerful? I have the burning fruit.

-Do you think that your thunder is very powerful? I have a thundering fruit.

-Do you think that your otter is very powerful? I have the frozen fruit.

-Did you said you want to die? Don’t worry, I also have a nickname: Death Doctor.

- Description from Novelupdates

15 years ago the world discovered magic as well as mythical beings (basically beings from various legends) in another dimension. Humankind learned to summon these dangerous mythical beings and use their power to great effect. Seven countries formed contracts with these “mythical beings” and gained their allegiance as a result. The mythical beings will choose their summoners on their 14th birthday and give them a stigma. Schools have been set up to train summoners and magical swordsman (basically bodyguards that give the summoners time to cast their spell) as a result.

15 years later after the finding of magic Kazuki Hayashizaki is chosen as a summoner and given a stigma to indicate that. This is surprising since males aren’t chosen as summoners due to their low amount of mana compared to females. As the first male to be a summoner Kazuki is under a lot of scrutiny by almost everyone.

To complicate matters his sister (who’s a magical swordsman) is against him going into summoner school to train there as a summoner. Because summoners and magical swordsman have a cat mouse thing going on where summoners look down on magical swordsman as inferior so his sister naturally is against him going there. She’ll stop him even if it means going to war.

Kazuki however is determined to thrive in summoner school and has already determined to give it his all. Even if he’s the lowest ranked student (ranked E) and his fellow students intend to demean him he’ll prove himself as the strongest summoner.

I died in my world… and woke up in someone else’s story.But not as the hero. Not as the villain. Not even as a side character who mattered. I’m… an NPC—a nobody, a background observer, invisible to everyone.At first, I thought I was powerless. But then I discovered something strange: I could leave notes, whisper hints, move objects… small nudges that subtly changed the story. Every tiny action rippled through the plot, shaping outcomes, saving lives, and altering the fate of heroines, heroes, and even villains.The catch? The story is alive. It resists interference. Push too hard, and accidents happen. Plot twists turn against me. Minor disasters loom. The more I try to influence, the more the story fights back.So I play carefully. I study. I manipulate quietly. I watch the heroines, heroes, and overlooked side characters, weaving invisible threads that guide them. I don’t fight. I don’t cheat. I survive—and maybe, just maybe, I can change the story from the shadows.From an unnoticed NPC to the hidden hand behind the world, I’ll prove that even a nobody can rewrite the story.