I know this isn't exactly the story but this is what I thought was going on the first time I saw it.
Normal pov
"THE VOCALOID'S HAVE BEEN A FAILURE. THEY WILL ALL BE UNISTALLED AND RECYCLED"
The blond haired boy takes the same faced blonde hair girl hands and runs away from the dead bodies of the scientist.
He keeps running through the building trying to find and exit.
Big brother Kaito is gone.
Big sister Meiko is gone.
Trying to find an exit he runs by Miku's disposal room to see her being torn apart.
When she sees him she reaches for the window as if screaming for help with the voice they took out.
The shota and his sister will be next so he keeps running and searching for the exit; he can hear the footsteps of more scientists chasing after them.
He soon trips and with tears in his eyes he asks with panicin his voice, "Rin! Where's the exit!?"
"Over there," says the clueless robot girl pointing in front of him where a stair exit door is.
He looks at her, realizing he won't be able to escape with her.
Tears fall down his face as he runs towards the exit.
A scientist comes up to the girl and ask her "where is Len?"
She points to where Len was running and a group of scientist run towards him.
She then glances over at a door that says "Len Kagamine Disposal Place"
Then she looks back over at the scientists who are holding weapons.
The girl then understands the situations and picks up the bloody knife the boy dropped.
The boy trips 5 feet away from the exit to see scientist with guns and knives coming at him.
"AHHHHH!" a scream breaks in the air.
More scientist come trying to grab him when one by one they all fall until he is faced by a bloody, knife holding Rin.
"Rin?"
She stands over him holding up her knife.
He blacks out then when he comes to his senses sees the scientist dragging him away.
"We may have switched clothes but you will still be a nobody," says his sister dressed in his clothes.
"Congragulations Rin," says master.
"You are the final VOCALOID"
Hope this was okay =)