Young Iris is an apprentice at the "Emotional Observatory", responsible for monitoring "emotional storms" caused by strong emotions in various places. When he discovers that these storms are not simple disasters, but the "lament" of the imbalance of the underlying rules of the world, he must embark on a journey to find the legendary "Heart Stone" that can balance emotions, and face a cruel truth: the so-called "Era of Peace" may be just a huge lie.
