Sakura Saka's work is to protect call girls - a service where girls are sent to a clients' meeting places and give them steamy sexual services. Day after day, Sakura escorts these prostitutes to meet their clients, listen to their stories and help them out when they are in trouble with aggressive and quirky customers.

In Esora, a city built around a colossal radio tower, a young man -- Nishina Kazu -- tires of the unchanging everyday world that he captures on his video camera. One day, as he is video taping some abandoned buildings, there is suddenly an explosion and a girl called Mamiru Ai appears before him. This marks the beginning of the change from the ordinary that he had been hoping for...