League of Legends: Peerless Sword Demon

A young man on Earth who was confused about life was brought to the world of League of Legends by a meteor. He became the adopted son of Soraka and the younger brother of the swift swordsman Yasuo. Why was he, who was respected by Ionia, expelled? Why is he called the Sword Demon when he has the reputation of Gale Sword Soul? Everything is in the Storm Sword Demon of League of Legends.