Picture a mermaid.
Most people imagine a beautiful woman whose lower body is that of a scaled, green fish. Maybe she can sing real swell and maybe she is longing for love. But regardless, she is two halves that make up an entire whole.
Valkyrie Drive: Mermaid is the same. Mermaid is one half sex and one half tale, making it one not-as-bad-as-you-may-imagine anime.