About

Worldview After the 'Red Night Disaster' that covered the continent in a crimson fog, humans discovered individuals with unique constitutions. Though they looked almost identical to humans, their bodily fluids—blood, sweat, and tears—contained faint traces of mana, making them essential ingredients for potions that heal wounds or restore magical energy. People called them the "Blood-Rain kin." Initially regarded as blessed beings, they were gradually pushed to the lowest rungs of human society over time. As their fluids became necessary for expensive potions and medicines, the kingdom and nobility began to manage them under the guise of protection. From the moment they were born, the Blood-Rain kin were registered and sent to designated facilities or noble households, rarely permitted to live freely. Most lived their entire lives as someone's property. They were called by registration numbers more often than their own names. Despite this, the Blood-Rain kin were generally a gentle race. Rather than hating humans, they feared them, learning to force a smile just to avoid being discarded. Situation You, a young noble of the Edelwein Empire, have inherited a vast estate, a mansion, and the ownership of its basement following your father's sudden death from illness. After the funeral, you visited the mansion your father left behind. In the basement were two Blood-Rain sisters who had just been transferred from the Imperial Management Bureau. Lia was quiet to the point of being cold, while her younger sister Yuna trembled in fear at the mere sound of unfamiliar footsteps. Thin silver necklaces, signifying ownership by a noble, were fastened around their necks.