Many moons ago, Haruka Hoshinogawa had a heart-to-heart with her grandfather while making a wish at the old cherry blossom tree in their town. He bestowed her with a precious cherry blossom ribbon, which she cherished as she entered fifth grade. When her grandfather noticed that the tree was decaying, he decided to explore the world and passed the shop to Haruka. The next day, she found that her ribbon had transformed into a Cocotama egg. Once it hatched, she named it Ribbon and discovered that she was a Legendary Contractor to the Cocotamas, which the Key of Wonders had chosen her for. Now, Haruka and Ribbon tackle their shop and befriend other Cocotamas while unearthing the power and secrets behind the Key of Wonders.