High school student Takeru Takemoto works part time as a (motor)bike courier. During one of his deliveries, he saw a mysterious light passing him and fell into a forest. What he had found was a beautiful girl coming out from a glowing cocoon, calling herself Hikari. While Takeru was quite embarrassed because of Hikari's nudity, a strange monster suddenly showed up and immediately attacked the two. Both Takeru and Hikari demonstrated the power of their other selves before Takeru had a clue of what's going on. (Source: ANN)

Loudmouthed martial artist Junpei Ryuzouji, elegant actress Airi Komiyama, and cheery but artillery-obsessed student Ritsuko Inoue all find themselves transported from their homeland of Japan to an unfamiliar, magical world. When the elven priestess Celcia Marieclaire casts the spell to send them home, she is interrupted, and the spell is broken into parts that scatter throughout the world. The spell fragments imprint themselves onto the skin of various elves. The trio travels in Ritsuko's tank, searching for elves who might carry the spell fragments so that Celcia can transfer them to her own body and make the spell whole again. As they adventure, people begin to refer to them as Those Who Hunt Elves, gaining a reputation as warriors that put a stop to evil-doers with their miraculous cannon, terrifying elves by stripping any that they find. Though they're not the smartest group, they make up for it with enthusiasm and their strong determination to get back to Japan.

The catastrophe, Hammer of Eden, resulted in the loss of six billion lives and the flooding of 90% of the land. The New United Nations were formed to pursue peace on the ruined lands 14 years later. Keel is a boy living in a town called Yabitsu, an area which prospered due to the energy from the nuclear generator brought by the catastrophe. His next kin, Aoi, is the secretary general of the New United Nations. She views the catastrophe as an opportunity to create a new world in which nations can help one another overcome differences in races and religions. However, her efforts to realise that vision fail because of the unwillingness of the nations to change. Gould, a military officer, feels that the only way to make an order is through the military. Using Ulysses, a nuclear submarine, along with his crew, including Keel's brother Tean, Gould carries out a coup to declare war against the New United Nations in his attack on Yabitsu. (Source: ANN)