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The distant future: Humanity established the mobile fort city, Plantation, upon the ruined wasteland. Within the city were pilot quarters, Mistilteinn, otherwise known as the “Birdcage.

Due to humanity obtaining the data technology that has evolved to a great amount—called "Mana"—the human race is able to subjugate all wars, starvation, pollution, and other problems on Earth by using its power, which is similar to magic. Earth has obtained the utopia of complete peace and no wants.

The story follows Kaizaki Arata, a 27-year-old jobless man, who fails at every job interview he had after quitting his last company. His life changes after he met Yoake Ryou of the ReLife Research Institute, who offered him a drug that can change his appearance to 17-years-old and to become a subject in an experiment for one year.