Operation: Billingual OTAKU

The master of the Vocaloids decides to work on a new project: Vocaloid: Billingual Otaku! When all four girls are created, the master introduces them, and love begins to blossom between them. But when they find out one is unstable, will she have to be uninstalled, or can the master save her programming? Rin X OC, Gumi X OC, Kaito X OC, Neru X OC (M for Lemony later and safety!)