The Sanguine Thread | Futanari (English version)

Deep within a valley severed from the outside world, Eternal Rose Manor stands towering, concealing secrets of the blood.

Elina, a young woman who has lost everything, decides to barter her soul and purity in exchange for sanctuary, becoming the personal servant of Countess Rosalind—a lady of breathtaking beauty, yet cold as ice.

However, her duty is not to attend to comfort or chores, but to serve as 'sustenance' and a 'source of energy' for the ravenous demoness.

From a contract of blood... evolves a relationship far deeper than that of master and servant. When the agony of being devoured transforms into an addictive ecstasy, and the vampire's frozen heart begins to beat violently once more... amidst the looming shadows of death, the red thread of fate is drenched in crimson until it can no longer be severed.