In the year 2039 of the Galactic Calendar, on the planet Mars, Shiraishi Ageha is condemned to the death penalty on grounds of murdering four individuals. Supervising the detention facility where Ageha is held is Kisaragi Ayako, while the task of guarding her is entrusted to Kenzaki Kyousuke. The narrative revolves around the quest to uncover the reality of the situation.