Kimihiro Watanuki is the indentured servant of Yuko, the beautiful but completely unpredictable Space-Time Witch.
He must work at her bizarre wish-granting shop until he can pay off his own wish: to be free of the spirits that haunt him.
Yuko's latest customer is a rain spirit who wants Kimihiro dispatched on a rescue mission.
Little does Kimihiro know that this mission will take him to death's door. And that's not his only problem: a cute spirit has given him a Valentine's Day present, which means he's obligated by Japanese custom to return the favour.
What do you get a girl who may not even exist in this world?