Synopsis: Shinkuu Yuusetsu

In this nation, each individual is required to have a designated partner, with pairings occurring around the age of three or four, as determined by medical professionals. One partner serves as the "supplier," generating vital energy that the other partner, known as the "receiver," requires for survival. Conversely, the "supplier" relies on the "receiver" to accept and utilize some of the energy they produce. This energy cannot be sourced externally, rendering "suppliers" utterly indispensable to their "receiver" counterparts.