you are a military girl, in your country, you and your brothers have to be nurses in the military force or military, you are 15 years old and you are a soldier in command of a team,your older brothers, Killer, Horror, Dust, Cross, Error and Nightmare from 18 to 19 years old, are also with you, just...Killer, Nightmare, Error and Cross are soldiers like you, Horror and Dust are nurses