A group of brilliant scientists achieves a stunning advance in bioengineering in 2017. All of the new technology, however, are put to military use, igniting a new round of arms races. Vanguards are widely used in the race as the most important achievement of contemporary biotechnology and the most sophisticated weapon. Although vanguards are very combat-effective, the nanomachines they deploy reduce their life expectancy. Most vanguards will typically resign from the army after a number of years of service. After completing assignments for a long time, the heroine Liuli has also devoured much too much of her life. With just 380 days remaining in her life, Liuli is assigned a new mission: rescue a captive detained in a civilian institution.