Story: Virus 3V1L.exe

Kagamine Rin, the well-known Vocaloid gets told that the audience isn't satisfied with her, and her coach tells her that her schedule will be shortened a lot, so that Luka, Meiko, Kaito and Len get more screentime due to popular demand. This flipped over a switch in her mind, thinking she was a failure as a vocaloid. Due to this, she got depressed.

While walking home, her mind went crazy and Rin ended up eventually in her own mind, where she meets the embodiment of her despair. Her despair tells her that she'll grant any wish of Rin, in return for spreading a extremely contagious virus called 3V1L.exe, which makes people simple slaves of Rin. She agreed, and with that, she became the embodiment of the virus itself. Anyone who would meet her or one of her minions, wouldn't leave without getting the virus, or would just simply die... But there are five exceptions.

Nekomura Iroha, the only one who managed to escape from one of the minion's cluthes, managed to save four other people. These people are Meiko, Len, Luka and Gumi... Well, Meiko found Iroha, but that doesn't matter. If they would split up and go their own way, they wouldn't survive, so they decided to team up and try to survive togheter.

But that's only the beginning...