The Vampire's Bride: A bride who gets married to vampdoll

We set our scene in the Meiji era. Having lost her grandmother, Shirafuji Sana found herself completely alone. With nowhere else to go and nothing to eat, she turned to the Imperial Army and its strange 'bride thorn' program. Bride thorns are girls offered up as rations to the Vampdolls - blood-drinking women conscripted into the Army as its fiercest soldiers. Starved, desperate and completely unaware, Sana was made to sign an enlistment contract, only to be promptly introduced to Hanafusa Yukine, a beautiful, yet scornful Vampdoll. At first, the two were far from an ideal match. With time, however, little by little, they began opening their hearts to one another. On their first night, they learned just how exhilarating - physically, emotionally - sucking blood can be. This came as a shock, but the two, awkwardly, trustingly, successfully made it through their first feeding. Not long after that, they were sent out for active service and Yukine was incapacitated in the fighting... [Translated from the official description]

The era is Meiji. Sana Shirafuji, who lost her grandmother and is left alone in the world, knocks on the military's door to become a "Bride Thorn" to make a living. A "Bride Thorn" is a "ration" for girls known as "Vampdolls", who are specialized in combat. Unaware of this, Sana accepts the military contract out of desperation. On her first day of enlistment, she meets Yukine Hanafusa, a beautiful yet disdainful Vampdoll. Born into a noble family, yet cursed from birth as a Vampdoll, Yukine is persecuted and reviled as a “monster.” Shunned even by her own family, she loathes her bloodthirsty impulses and keeps others at a distance— rejecting Sana as well. Yet, little by little, Sana and Yukine open their hearts to one another. On the night of their first bloodsucking, they are startled to learn that the act brings heightened physical and emotional sensations. Awkward as they are, the two nonetheless share their first experience of bloodsucking together. Not long after that, during a certain operation, Yukine is rendered unable to fight. Standing in their way as an enemy is Satsuki—once, a trusted comrade……。