The A-Virus (Armed Virus) is an incurable virus that infects females in Valkyrie Drive Mermaid and Valkyrie Drive Siren, and as such is observed on both Mermaid Island and Siren Island.

Unlike viruses from other media, it does not kill the user/host in contact, but instead it gives supernatural magic/ability to use a weapon-transforming process known as "Drive".

The Virus divides the infected into two categories: Liberators and Extars.

When they become aroused, Extars are able to transform into a specific weapon form, while Liberators have the capability of wielding these powerful weapons.

As such, the infected, known as Valkyries, are often paired up with their most compatible partner.

Limitations[edit | edit source]

According to Kasumi, the A-Virus was a non-lethal viral system that can only infect some girls.

Navigation[edit | edit source]

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