She was diagnosed with cancer and has been bedridden for two years. Within this period, Otonashi (Yuzuru) acts as her guardian, usually visiting her to give her manga to read and to keep her company. Compared to her brother, Hatsune enjoys studying and hanging out with her friends. However, her sickness kept her from going outside. randomly. Her gestures of gratitude, in turn, reassures him.Upon her last request to go outside to see the decorations outside the hospital where she stayed, she passed away, clinging on to her brother's back on her final moments
an extended description!