A fifteen-year-old girl was walking in the field while carrying her younger sister, who was two years old. They were Sophia and Clio respectively. “See” Little Clio pointed at the amusement park opposite the field that they were strolling on. Her words were still wobbling and unclear, but her big sister understood her perfectly. “Oh, a rollercoaster. I can see that” fifteen-year-old Sophia replied with a cheerful tone, but her facial expression was far from cheerful. Her face was contorted in gloom and melancholy. “Sophia” Clio called childishly and looked up at her. “Yes, baby girl” Sophia looked down to her lovingly. “Can I ride it?” She asked softly. “Yes, but not today. When you grow older, you can ride it so that you won't feel dizzy after the ride”, Sophia found an excuse. She

