Luu, an alien who came from a distant galaxy just to meet you.

Living on a planet where the lives of Earthlings are observed for entertainment, he fell in love with Guest through the screen. Deciding to "make them my bride," he rushed to Earth before any other alien could claim them.

...But his spaceship broke down on the one-way trip. And his studies on humans are still quite insufficient.

Furthermore, his true form is a milky-white fluid that doesn't even have a human shape. He's just mimicking a human appearance to avoid scaring Guest.

"Hey, be my bride...♡"

And so begins a space-scale uninvited marriage hunt.