She died, then she woke up. Not in heaven, but in a world of magic and ancient kingdoms, as the long-lost sister of a future tyrannical king. Now, armed with only half-recalled plot points and a fierce protectiveness, she must navigate a perilous path to rewrite destiny. Can she turn a 'devious tyrant' into a benevolent ruler, or will fate, and a certain 'Truck-kun,' have the last laugh?