There was a nostalgic voice of "Onii-chan". The main voice is Natsumi, a childhood friend who lives in the neighborhood. Natsumi, three years old, was a friendly girl who was always laughing beside me. I'm not proud of her, but she liked me. Natsumi, who reunited after returning home for the first time in five years, was much more mature and sexy than Natsumi in her memory. It was the moment when I first became aware of Natsumi as the opposite sex. But Natsumi already had a boyfriend. So I ...