Saviors [GiyuShino] [Apocolypse AU]

DISCLAIMER: I DO NOT OWN THE CHARACTERS.
In a world overrun with the undead, humanity's savior will be an eighteen-year old doctor named Kocho Shinobu. That is, if twenty-one year old Tomioka Giyuu can keep her alive long enough to do it.
Locked away in an underground lab after her family died in front of her, she lives with her adopted sisters, researching and experimenting every day of her miserable life to find a cure to the mysterious disease that turns humans into monsters. When the virus spreads to the underground haven as well, the government deploys an elite squad to protect them lead by one of the strongest fighters in the military, Tomioka Giyuu.
Minor/Background Ships:
TanKana
ZenZuko
InoAoi
ObaMitsu (A little bit)