Shinkuu Yuusetsu

In this society, mandatory partnerships are established through medical assignment when children reach the age of three or four. These bonds create an unbreakable biological symbiosis between two distinct roles: the Supplier and the Receiver. This system is not merely social but physiological, as the continued existence of a Receiver depends entirely on the regular transfer of vital energy from their designated partner. Without this periodic infusion, a Receiver cannot survive, making the connection between them an absolute necessity rather than a choice. Conversely, Suppliers face an equally critical imperative, as they must have a willing Receiver to accept the unique power generated within their own bodies. This energy cannot be synthesized artificially or sourced externally; it exists solely within the Supplier’s physiology. Consequently, the relationship forms a perfect, inescapable cycle of mutual dependence where both parties are biologically compelled to maintain their bond. For Receivers especially, their Supplier represents an irreplaceable lifeline, rendering them completely indispensable to their partner's survival and establishing a profound dynamic of reliance that defines every aspect of life in this world.