In a small town in the mountains on an isolated island is Ultramarine school. In school, children learn this force who received the highest score in the state test for social incompatibility. The protagonist of the Kuroshio tight, get a deep emotional trauma during childhood, gaining in this test is incredibly high score, and fall into this school. His life becomes more joyful when he finds himself unwillingly in broadcasting club and lead other students in it. The club becomes a 8 members, and each has its own cockroaches in my head. But the fun does not last long life radio club. After a series of tragic events radio club members a serious quarrel among themselves. In a desperate attempt to reconcile them, Melt organizes a training camp in a mountain camp in the last days of summer vacation. But it turns out just more big fight. Frustrated and irritated, members of radio club returned to the city, but woke up to find that apart from them in the city there is no living creature. The bacteria - and they disappeared (food ceased to deteriorate). There is no electricity, running water is not working. Only a mysterious girl Nanak is sometimes found in the way the main character, each time disappearing without a trace.