MTL - My Koi Sister is Three and a Half Years Old - Chapter 464 The strongest backstage in the three worlds

A heroine dedicated to creating great wands and magic props;
A heroine dedicated to 100%(?) avoiding mischief and bad luck;
Meet George Weasley, a resourceful(?) daring, careful prankster for twenty years.
Is their collision a lose-lose or a win-win cooperation?

This is the story of Miss Ollivander, who doesn’t know the development of HP’s story, and the lovely Weasley family, George. In addition to the magical joke product and the Horcrux Deathly Hallows, how can other magical items help in the world of HP?
[I want to save all the characters I want to save]

Editing!
I reread the first few chapters over the weekend and found a lot of typos and bugs. In order not to affect your reading, I will revise a few chapters every few days. The plot will not change, but I will fix the problems raised by my friends in the comments before~ Sorry readers who have read it!
Content Tags: Anglo-American Derivatives

Search keywords: protagonists: George Weasley, Gwen Ollivander ┃ Supporting roles: Fred Weasley, Harry Potter, Ron Weasley, Hermione Granger ┃ Others: HP Doujin

One sentence introduction: If you can’t save the world, then save your brother?

Intention: fall in love with George Weasley, do scientific research, and invent. If you can participate in saving the world, accompany your boyfriend to help.

- Description from novelbuddy

❗[Current Writing Contest-WebNovel Spirity Awards 2025 Fantas]❗Flain grew up in a futuristic world. When he was born his parents didn't want him because he didn't live up to their expectations and so he ended up very badly.Flain was employed as a slave. He was forced to mine radioactive iron deep in the mines. It was drilled into his head that he existed only to obey orders.Young Flain was obedient. He doubted some of it but knew nothing else. For years, he never saw a single ray of light; light was only spoken of among the others as a legend.The routine was the same: in the morning, he would take a nutrient tablet and water. Then he would mine all day, sleep eight hours, and repeat.Flain worked like this from childhood until he was ten years old. He even found a friend, but that friend died of radiation poisoning right in front of Flain. Flain couldn't stop mining. He kept mining with tears streaming down his face.Before bed, Flain cried. “I will become the strongest. I will kill you all, and you will become my slaves.”Flain stopped crying, stared blankly at the rocky ceiling, then looked ahead. A manic grin appeared on his face, one that would often adorn it from that moment on.At the age of ten, Flain was assigned to a military camp due to his endurance in the mines and his survival against radiation.In the camp, Flain was trained. The regime was much looser; he even had an hour of free time each day. However, Flain didn't make any more friends. Even during his free time, he trained with a smile. He would achieve his goal at any cost, even if it meant training himself to death.Experiments were conducted on Flain. He lost his hair, two long gray arms grew on his back, and a third red eye appeared. Flain became a mutant.Flain was then sent to war. He fought with sharp katabas. He performed quite well in the war, earning himself command of ten soldiers and becoming a small commander.But one day, everything changed.Flain then dies, is swallowed by darkness, and Flain refuses to die, thus appearing as a skeleton in a fantasy world.

A world where the [Demon King] was defeated by a [Hero] that came from another world. People carelessly forgot about their fear of the [Demon King] and of monsters, living in peace.

In a forgotten and run-down cave in the mountains, a new monster that should not have been born was given birth.

The monster’s name was the [Black Ooze]. It was nothing exceptional other than its black color, an ordinary slime.

However, this slime had the special characteristic of being able to take the abilities of the living things it swallowed. It preyed on an insect that had paralytic poison, as well as other animals. Following that, it attacked a human, obtaining his knowledge and [Desire].

Before long, the monster established its target as the female mage that came to explore the cave.

This world still wasn’t aware.

Possessing immortal arts, he can give life and he can bring death. Treading upon thousands of heroes, every corner of the city has his legend…