I ban you because Vocaloid is a Japanese singing program. I'm not sure about all of the details, but it basically is an artificial singing voice with a personification, like Rin and Len. Anyways, the people aren't diseased, they're IMMUNE to the disease (which is ravaging mankind), and insane doctors are after them to do experiments and find the cure, but everyone who's come back have come back....changed, so they have to run from these insane 'Doctors.' Anyways, this is off-topic so just visit the rp thread and i'll explain better.