Born To Run

So basically, this whole story starts with the most RANDOM glitch in the universe. Lucy Pevensie is just minding her business in England, 1941, trying to survive being the smallest sibling and pretending she's over the whole "Narnia" thing (she's NOT). And then suddenly- BOOM. Percy Jackson literally falls into her wardrobe like he missed the entrance to Camp Half-Blood by 4,000 miles.

Lucy screams. Percy screams. Everyone screams.

Then Wendy Darling floats in like she took a wrong turn from Neverland, and Harry Potter shows up acting like he's late for Potions class even though he's miles from Hogwarts. Nobody knows anything. Everyone is confused. It's like the universe purposely threw four chaotic magical children into one house to see what would happen.

Spoiler: what happens is a LOT of arguing, bonding, running away from adults, almost breaking everything, and eating every snack Lucy can steal from the kitchen.

They don't get along at first - Percy's too loud, Harry thinks too much, Wendy tries to keep the peace (but she kinda fails), and Lucy is this tiny ball of rage and heart. But slowly, they find out they actually... weirdly work together? Like a team that wasn't supposed to happen, but kind of feels right.

Sometimes, Lucy watches them laughing and thinks:
"I don't know why the universe sent them here... but I'm glad it did."

This isn't really a big epic adventure story (...well not at first). It's more like four kids trying to survive each other, survive England, and survive the weird magical disasters that keep happening around them. It's friendship, chaos, jokes, yelling, and moments that hit you right in the heart.

No spoilers, but yeah - they definitely weren't born in the same world.
But maybe they were born to run into each other.