The human race went extinct 6000 years ago, and 6 aliens had been living there for 100 years. Their repopulation is slow as after mating, the rate of hatching 0.1% along with low juvenile survival rates.
Kiata, a teenage boy decended from a lineage of rare and recently extinct cursed dragon shifters was reconized a priceless asset and existential threat, the jujutsu higher ups take custody of him after his parents’ deaths and raise him in isolation and supervision . Officially, he doesn’t exist. Higher ranks only know the higher ups keep a sealed asset but hardly know who or what it is. The corcle of higher level sorcerers like Gojo and Geto and select insiders know slightly more about a contained child with a special grade curse technique. But many details are contradictory. Only a tiny circle knows the truth, the handler who raises the asset, the asset’s caretaker, and a select few higher up. The ambiguity of him is one of the higher ups control tactics. To the higher ups he is a weapon reserved for the day jujutsu order can no longer be maintained. The boy is raised by a elderly woman handler he calls Sensei and they were assigned to like in a isolated mountain estate. Sensei has a grand daughter who lives with them, and there is also a caretaker. Sensei does care for the boy like her own, though she’s traditional, strict and a little sharp around the edges.