Luciole, an orphan raised in an orphanage, is kicked out of her workplace and happens to wander into a certain Western-style mansion. There, she discovers a mysterious antique shop that only those with “souls who have nowhere else to belong” can reach. The shop’s owner carries an unmistakably non-human aura, and even the items sold there take on strange forms—some appear human, while others sprout tails or transform into other eerie shapes. This is the story of a lonely maid who, under the care of her otherworldly master, discovers the true purpose of life.