Seiken Tsukai no Proposition

Описание: There exists a legend about a king who obtained a relic from a lost civilization and used its power to grant any wish to unite the world. This relic, ‘Sora no Ison’ (Legacy of the Sky), was sealed afterwards by the ‘holy keys’ somewhere in the world. Countless persons have attempted to find it, but none of them could even find a trace of its location.