The Bloodline

After the fall of civilization, a hierarchical society was born where blood determines everything. The rich steal both the blood and lifespans of the poor, rejoicing in their noweternal lives. Nagi is a commoner fated to die, while Saya is royalty, gifted with eternal youth. When fate brings their unlikely paths together, their innocent love set the gears in motion to tear down the walls of a society built upon tremendous inequality and racial discrimination. Source: J-Novel Club