I heard a nostalgic voice calling 'Onii-chan.' The owner of the voice was Natsumi, my childhood friend who lives nearby. Natsumi, who is three years younger, was always a lovable girl who laughed by my side. Although I'm not being conceited, she liked me. When I met Natsumi again after five years, she seemed much more mature and attractive than the Natsumi in my memories. It was the first time I saw Natsumi as a member of the opposite sex. However, Natsumi already had a boyfriend. So, I... *The recording content may vary depending on the distribution method.