My cousin Natsuki, who is three years older than me, has always been like a real older sister, taking good care of me and my younger brother since we were kids. I've harbored a secret, unrequited love for her... After three years since I last saw her, I finally reunited with Natsuki. My brother is still the same spoiled brat, always clinging to her. This trip home was supposed to be about confessing my feelings to Natsuki, who I couldn'