The ancient sphinx ancestors from different planets in the Coil Galaxy send their children to three young planets to be educated in different technical colleges in Fiesta, Libra and Futura. The children's true identities are hidden from them and their parents with Strategy 3303T so that the sphinxes could not play favoritism to their cherubim. Although they speak different languages in each planet, the common language is Terralink on Terra where cherubim incarnate, learning to live with other species in universal peace and having their characters tested.