After being forced to resign from her publishing company job when her magazine goes out of circulation, office worker Haname Jinchoge (Kumiko Aso) stumbles upon the name of her real father-Noburo Jinchoge. Flustered, she tries to confront her mother (Keiko Matsuzaka), but she had recently been rushed to the hospital after falling in a pond while searching for kappa. Eventually it's confirmed, and Haname decides to visit her father (Morio Kazama), who happens to be the storekeeper at an odd antiquities shop called Light Bulb Co. However, she's initially doubtful, and keeps her relation to him a secret.
Haname becomes fascinated with the various oddities and charm of Light Bulb Co., and being closer to her father makes her decide to become a shopkeeper herself. Customers are hard to come by, but she listens to her dad's strange advice-like running the faucet whenever life is happy-and gains the support of a punk rocker named Gus (Ryo Kase). One day her father offers to sell her the key to his warehouse for 1 million yen to fund his next trip, which she excitedly agrees to without thinking. However, when she discovers a shocking fact about Light Bulb Co. she chucks the key away in disgust. She later realizes that she's been stubborn not telling Noburo he was her dad, but by the time she runs back to meet him he's already gone. Eventually Haname and Gus decide to find out what treasures are hidden away in the warehouse she inherited.