I Became a Savior Battle Maiden on an Apocalypse Livestream

[Ding! The Host crashed into a huge stroke of luck (a truck) while saving a child. System bound!]

[Respecting the old and caring for the young earns supreme merit! A parallel world has been selected to grant you a chance to be reborn: the Z-Virus World.]

[Please use the serum to prevent yourself from turning into a zombie~]

I understand all that, but what do you mean the side effect of the genetic serum is turning into a cute, soft girl?