Person Who Pursues Death

"Are you willing to make a contract with me? Young man." "Yes! I am willing. As long as I can save her, I will do anything." The young man shouted into a puff of black smoke with tears on his face. "Hurry up! Save her." "Who are you? I agree." The boy screamed at something that didn't exist. "It hurts, it hurts so much, Brother tide... It hurts so much!" The girl in the boy's arms began to cry, which increased the boy's panic. "The cost of being connected with me is high, but I can make her stand up again." A female voice came over. The boy looked up and found a human-shaped black shadow standing at the girl's feet. There was also a paper full of strange words on the ground...