Suguru and Mahoro-san rescue a cyborg girl fleeing from the evil Earth organization, the Keepers. The girl without a home begins to live at the Suguru residence as Mahoro's little sister, "Minawa Andou," however, Minawa is secretly receiving orders from Professor Methris.
Touched by Suguru and Mahoro-san's kindness, Minawa's mission causes her great grief. Having learned from "Keepers" Android #154 that Mahoro cannot use more than 30% of her active duty capabilities, Methris plots to capture her! The disarmed Mahoro-san has little life span remaining. Her systems stop functioning in 126 days...
Story by Bunjuro Nakayama and Art by Bow Ditama.