Esoragoto manga

Esoragoto summary:

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...