"You killed Mother by being born!" The younger sister, continually blamed by her older sister, was forced by her to keep making special magical spinning thread. The older sister took credit for this work and became engaged to the crown prince... until the bullied younger sister finally finds happiness.

My mother died because she gave birth to me. My older sister and father blamed me for her death, saying it was my fault that mother died, and I was bullied because of it. I possessed a special power to create magical thread called "spun thread," and clothes made from this thread held special powers. High magical defense, easy magical enchantment, and other abilities. My older sister claimed that she had made clothes from this thread with her own skill, and eventually became the fiancée of the crown prince. From that point on, I was told to spin more thread, and I was on the verge of death...