When the Isshiki family runs into monetary troubles, their last option is to turn to the "God of Fortune" that resides in their house. However, instead of helping them, he says he'd rather see their entire family destroyed! Determined to save his family home, Tarou, the cheerful, good-natured younger son, takes it upon himself to uncover the secrets of Kami-san's past and figure out why their God of Fortune has turned into one of misfortune...