Keita and Yuri who visited the countryside by relying on Hatsue, a big aunt of Yoko who is a classmate, for the task of Japanese history. The purpose was to listen to the war experience and put it together in a report, but Keita had another reason. She was asked by Mayuko of the development department to experiment with a "remote communication blocking system". When the experiment started, Seven received a strange radio wave ...
