[Based primarily on the Harry Potter movies, with some FGO elements added] [The author received guidance from Rowling; this is not random writing or based on assumptions, so please read with confidence!]

[The main character will not become the Saber King; there will only be a few chapters where he/she becomes a girl for fun. I couldn't think of a better name at the time, so I just used this one. The name will be changed after the book reaches 200,000 words. If you mind this, please don't read on. I'm very sorry!]

When Lynn was reborn into 20th-century London, he thought he was living the life of a protagonist in a rebirth novel.

But tell me, what the hell is magic in this world?!

As Lynn gradually accepts everything and prepares to enroll at Hogwarts to learn magic and fight Voldemort.

Tell me what the hell a magic circuit is!

Fate is here, right?! Does that mean we'll have a Holy Grail War next?

Screw the Type-Moon universe, I'm quitting, I'm giving up!

With admirals everywhere and pirate emperors as insignificant as dogs, Lin Yi suddenly transmigrates to the world of One Piece and obtains the 'Super Auction House' system. Possessing this system, Lin Yi begins his legendary journey. Here, you will encounter countless items from other worlds and gain opportunities to change your destiny. And Lin Yi, with the system, will drink the strongest liquor and woo the most beautiful women. He will roam the world freely, manipulating all beings. Watch as Lin Yi stirs up the pirate world with his auction house.