Ishikawa Ginji hates anything related to ghosts, superstition and the occult with a passion. His "occult phobia" is so intense that he does not hesitate to reject any girl who appears to have even the slightest interest in the subject.

One day, after a particularly intense reaction to a haunted house lands him with a 600,000 yen debt, he is suddenly kissed by an elementary school student named Ageha, who then explains that she will use him to "wipe out every ghost in the world". While the sex appeal of the kiss is not enough to turn Ginji to her side, the fact that she "bought" him by paying off his debt in one go seems to work just fine.