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In the fantasy continent called Aldes, there is a girl named Fengyu. Her story begins with a runaway from home.

After several world wars and drastic climate changes, the surface of the earth is no longer suitable for human habitation. Facing the apocalyptic disaster, the remaining humans built several sky cities. However, the highly developed artificial intelligence has replaced almost everyone's work. Useful people occupy high positions, while incompetent people are not worthy of being human... As a top killer, the cyberman Shirono Rin, together with his assistant Chris, explore the meaning of existence in seemingly endless daily life, and think about whether there is a future for this twisted world.