The "Director’s Cut" is the definitive uncensored edition of the 2019 remaster.

The Gog Repack of Saya no Uta: The Song of Saya - Director's Cut includes several features, such as:

Saya no Uta is not a “fun” game. It has no choices (until the final branch). It features extreme body horror, sexual violence, and a protagonist who becomes progressively monstrous. It’s the literary equivalent of The Last of Us meets H.P. Lovecraft by way of Cronenberg .

The Director’s Cut, re-released in 2011, adds roughly 30-50% more content, primarily in the form of extended gore sequences, additional H-scenes that are more graphically violent, and—crucially—expanded lore regarding Saya’s origin. Where the original hinted at Saya being an alien spore or a bioweapon, the Director’s Cut details her species’ reproductive cycle with clinical precision. We learn that Saya is a larval form of an inter-dimensional predator; her purpose is to consume a world’s dominant species and replace it with her own kin.