Long ago, there was an ayakashi who challenged his victims to a battle of wits. If the subject succeeded, the ayakashi would grant them one wish, but if they lost, he would devour their soul. Only one person has been able to consistently defeat this ayakashi and his tricks: the clever Hanasaka Ikkyuu. The ayakashi follows him, ever eager to eat his soul, but for Ikkyuu, using the ayakashi's power to help others is worth the risk! When he chances upon a Yukionna (snow fairy) desperately in need of his ayakashi-extracted help, will his cleverness finally run out? (Source: MangaHelpers)

Kuhou Komado tries to scout Haimura Enjirou to the baseball club in Benten high school after hearing that he led Toyosawa to be runner-up in only one year and then suddenly disappearing like a smoke. But he has no time for baseball as he have 100 million yen debt. Benten is in dire situation that makes Kuhou Komado agrees to paying his debt in exchange for playing for them.

There once was a monster called Karma who loved to challenge his victims to a battle of wits. If the subject succeeded, the monster would grant them one wish, but if they lost, he would devour their soul. At the same time, there was a young monk called Hanasaku Ikkyuu, who was famed for his cleverness. He used to eagerly sharpen his mind, solving challenging riddles sent to him, until his mother fell ill. When he found that his cleverness was of no use in helping her, he gave it up. Karma seeks out Ikkyuu, eager to bet him in a battle of wits and consume his soul. One day, Ikkyuu rescued a young beggar boy, only to see him fall ill with a mysterious illness. That same day, Karma finally finds Ikkyuu and offers him his dangerous bargain. Thanks to Karma, will Ikkyuu finally have a way to use his cleverness to help the people around him? (Source: MangaHelpers)