Hexswitch: Apocalypse Prevention Squadron by yeahprobablyh

The year is 1970. The setting is Inversia, home planet of the candy golems and the most powerful empire in its galaxy cluster. A boy has travelled back in time to flee a famine that killed his caretaker. He resolves to search for them, but he will soon find that the Inversia of the past he must navigate is ruled by a rigid caste system based on blood colour, a caste system he just can't seem to slot himself into. The best he can hope for is to not find out what fate will befall him if people discover his blood.

He has landed in the middle of a war over the fate of the whole golem race, and his caretaker is caught within the crossfire. He'll need to do his best to save them-- If he doesn't die of starvation first.