Natsuiro Kiseki (夏色キセキ) is the story about four girls in the summer. There is a large stone in a Shinto shrine, and were rumors that if four people standing around the stone and pray for what everyone wants, then their prayers will come true. Natsumi, Saki, Yuka and Rinko are close friends since childhood. They passed many stories together both happy and sad. Until one day in the summer, they traveled to Shinto shrine to pray for their wishes. After the event passed and they lived to the present, everyone had grown up, forget some dreams and some stories that ever done during childhood together, but one day a miracle had happened to them. What is happening? What would their lives be like? The miracle stories of four girls are just starting.
Natsumi Aizawa (逢沢 夏海) cheerful and full of vitality. She lived with her mother and brother, so accustomed to help household chores. She is a member of the tennis club, have a habit of paying attention, but very stubborn. Saki Mizukoshi (水越 紗季) perfect girl both education and sports. She lived near Natsumi, and also a member of the tennis club as well. Her dream is a tennis champion, and not believe in the supernatural. Yuka Hanaki (花木 優香) cute girl who has a cheerful temperament, and disorder in the group regularly. Her family careers hotel business. She may need to help the family business for some time. Rinko Tamaki (環 凛子) sober girl who loves music. She was rarely expressed, had a simple idea, and intimate with Yuka.