Fireflies Flow Beneath the Night’s Blade

He was the sharpest blade in the Dark Moon Pavilion. He had never missed with his seven sword techniques. Until one rainy night, after killing someone, he turned and ran into a girl. She didn't run. She looked at him and said one thing: “You will bring a storm of bloodshed.” Then she fainted. He should have killed her, but he didn't. It was the first time he had spared someone he was supposed to kill. Later, he learned she was engaged to a prince of Chen. And five years earlier, he had killed the emperor of Chen with his own hands. She had come to find him. He taught her to hold a sword. She couldn't fight, so he said: “You don't need to learn. I'll protect you.” He smiled for the first time, and she saw it. He cried for the first time, and she held him. For the first time, he wanted to live, because she was there. Then he received an assignment. The target was her, and the mission was... To make her kill him with her own hands. An assassin has only one mission in his life. His final mission was her.