After the "Calibration" event, pre-humanity was completely destroyed. Post-humanity, reconstructed from the gene pool, relied on the creations left by pre-humanity to master some of the somewhat faulty technologies and barely took root on the earth. In this world where there is a certain kind of monster called "the dirty body", the organization "A. A. K" (Attention Attack and Kill) from the pre-human beings silently protects the post-human beings. Among them, the current leader of the action team, Etama Hirono, met his transferred classmate Miyano Hiashiro in his high school, and he felt an inexplicable sense of familiarity. After that, the two people started a wonderful story, like meeting old friends and talking to each other like new friends. Behind this strange feeling, a long-lasting memory gradually becomes clear, and in the shadows of the city, undercurrents surge, and a long-buried conspiracy will follow...
Concept: "Human beings don't believe in tears"/"No one has the right to deny people who live seriously"
