Academy City can classify almost anything. Flowery was born there as a Gemstone, a girl whose abilities manifested naturally and were officially registered as Level 2. To the city, she is only another number in a file—an unusual but manageable case. Yet, she remembers another life. Leading Academy City, trying to analyze something that cannot be classified; Espers can be classified, but some anomalies cannot be measured nor understood. And a flower determined to protect the people she loves may be the most dangerous one of all.