The original emotional entanglement between Akagi's half-sister and Sendao, Rukawa Feng and Sakuragi Koyuki. The story takes Chihiro Akagi as the main character. She is beautiful, strong and brave. In the eyes of outsiders, she is carefree and always has a bright smile. But in fact, she has an unforgettable and sad past. Her inner world was very small, so small that he could only be touched by him. But what was he thinking? Does he love her? Or do you just think of her as your childhood sweetheart and little sister? ? ? Will her wait come true? ? ? ?