The story begins with a twin brother and a sister who teaches to cook and manage a small café under their mother's guardianship. Everything was quiet and routine until one morning, twins discover that their mother fell into a deep sleep and will not wake up. Suddenly a strange old man tells them he has to fight a dragon to save her. Working together with three strange employees, the two brothers must figure out how to fight a dragon and manage their family business while finding a way to save their mother.