“Find the hidden son of Eraf. Then you will be free.” Jericho, a girl who grew up in a rural village. One day, she learns that her biological father is the hero, Eraf. She receive a ‘Dragon Slayer Sword’ as memento. As the new owner of the sword, her life has completely changed… Jericho wants to give up her position and live a normal life. A sword with an ego, Dragon Slayer Sword told her that Eraf has another son. Matthew’s son, Sansy Daisy Rosen Stars, the eldest son of the richest star in the black continent Magno Nupei, son of Princess Lillie Among the three candidates, we must find the real brother!