离开黑社会后，人称“不死之身的阿龙”的传奇黑道大哥以尽职尽责的家庭主夫身份重出江湖。

A young boy finds a robot dog in a forest under a pile of garbage. The two become close and spend time playing, fishing, and biking together as the seasons change. As the boy matures and, during a fireworks display, his city starts getting bombed.

At the end of the 21st century, a rare disease called “Cagaster” broke out, turning humans into huge insects. Two-thirds of the earth‘s population was devoured by these insects before humanity made a decision: they must exterminate the infected people. In the year 2125 – thirty years after the discovery of Cagaster – at the edge of the desert close to the “cage” of the insects, a young pest exterminator named Kidou finds a man close to death due to the wounds by insects. The man entrusts his daughter Ilie to Kidou and asks him to search for the girl‘s mother…