The story opens with a twin brother and a sister who teaches to cook and manage a small café under their mother's guardianship. Everything was peaceful and routine until one morning, when the twins found that their mother fell into a deep sleep and will not wake up. Suddenly, there is a strange old man who tells him that he has to raise a dragon to save her. Working with three employees wrapping from the café, the two brothers have to figure out how to put a meeting with a dragon, how to manage the family business and how to save their mother.