For high schooler Kei—and for at least forty-six others—immortality comes as the nastiest surprise ever. Sadly for Kei, such a feat doesn't make him a superhero. In the eyes of both the general public and governments, he's a rare specimen who needs to be hunted down and handed over to scientists to be experimented on for life—a demi-human who must die a thousand deaths for the benefit of humanity.

Photon batteries are an energy source created to save the resource-depleted Earth. Bellri Zenam, Aida Surugan, and their comrades have left the Earth Sphere to head for the source of these energy devices that cannot be manufactured on Earth. Now the Megafauna finally reaches its destination, the Venus Globe in the inner solar system. After battling the G-IT Corps, which plans to return to Earth in a Reconguista operation, Aida has an opportunity to meet with President La Gu of the Hermes Foundation, the organization that controls the production and supply of the photon batteries.

Kaibutsu Taro, also known as Kaibutsu-kun, the prince of Monster Land. Hiroshi-kun, a human boy who is close to him, takes advantage of winter vacation to head to Kaibutsu-kun's hometown, Monster Land. However, humans are strictly prohibited from visiting Monster Land, and Hiroshi-kun, who breaks the rules, is turned into stone by the power of the eyes of Kaibutsu-kun's father, the Monster King! Kaibutsu-kun goes to retrieve the secret medicine "Flower of Life" in order to restore Hiroshi-kun to his normal state. But that flower...