Xi Yan was an ordinary guy, but... in an unusual city. Every five years, strange black shadows appeared in their city for five months. When he was five, his father died from these shadows while protecting them with his mother. And at fifteen his mother died. Xi Yan is now twenty years old. Shadows engulfed the city again. Xi Yan hid as best he could, but in the end he always had to run away. Xi Yan was hit by a shadow, but shadows never kill, they only wound and wait for you to die. Xi Yan was lying and crying, when suddenly the guy running from the shadows quickly threw him over his shoulder and ran further. The guy brought him to the safe area and put him there, after which he healed his wounds. Before Xi Yan could thank him, the guy ran off to save people further...