Read manga Happy Sea WorldThe duchy of Hikarell, the most powerful force of the empire, not inferior to the royal family.Although their power is strong, various dreadful rumors abound due to their secretive nature.One day, sixteen years old Roel, who suddenly became a duchess, finds herself in the darknessRoel, like a dandelion seed, is unfamiliar to her step-parents like a different species. Her future husband, Asland, who seems to have known Roel for a long time, and Roel's hidden power gradually revealed.A timid girl who had shrunk back due to her stepmother's abuse finds herself.