Even after some of the ocaloids agreed to fight the corrupted with the humans, it still isn't easy... There's still so much corrupted monsters and some of them might not be as easy to kill... With enough help from everyone who the liquid hasn't taken control of, the survivors might be at least a little bit successful.. It's a matter of dedication and how much one would value humanity over having the corrupted liquid take control and slowly dissolve.. it's a war between two major sides... the survivors can only hope that it all ends soon...
