Naoki (Tomohisa Yamashita) and Riko (Keiko Kitagawa) become close friends without even knowing each other's names. It all started when Riko was practicing the violin in the park where Naoki was practicing shooting. One night, Naoki's girlfriend, Natsuki (Saki Aibu), comes to visit his house. Naoki's mother, Makiko (Miki Mayama), and his younger sister, Yuri (Ayaka Omasa), greet Natsuki with great joy. While they are all having dinner together, Natsuki's cell phone rings.