Despite his kind-hearted and sensitive nature, Ian Hasumi is known as "Ian the Liar" for a single reason: he can see things that no one else can. This includes fairies and "Tokage," a malicious doppelganger with lizard-green hair. When Ian reunites with Rin Ishinagi, his childhood friend and the only person who once believed him, news of "fairy murders" spreads throughout the city. The victims of these murders are easily identified by the wing-like bloodstains on their backs. Ian stumbles upon a murder scene where he encounters Kaito, a mysterious man who also discovers the crime. Kaito owns an odd shop that sells crystal cubes with insects frozen inside. Insisting that Ian saw nothing, Kaito gives him a crystal cube containing a lizard before bidding him farewell. Unfortunately for Ian, Tokage uses the cube in an attempt to take over his body and leave Ian as a spirit, destined to perish. Determined to change his fate, Ian makes a contract with none other than Kaito and his stingy fairy companion—all while hoping to reunite with Rin again.