Keita Aono is an ordinary high school student who loves to chat with his friends about military technology and the girls in their class. One day, Keita is surprised and delighted by a new transfer student in his class, his childhood friend Hinoki Sai. But when Keita tries to catch up with Hinoki after school, he accidentally wanders into Bottom World—an underground amusement park whose opening was canceled due to an unexplained tragedy. As Keita explores the area, he eventually finds Hinoki in the cockpit of a strange robot. She is here on behalf of Akamatsu Industries, a company contracted with the secretive international organization Mode Warp to investigate strange cases of violence worldwide. After joining Hinoki in the robot, the pair attempt to defend themselves against the various attractions of Bottom World, which have come to life and become violent. However, they are unable to escape until a man with transforming powers—dubbed Betterman—joins their struggle. Faced with an enemy he does not understand and a slew of mysterious new technology, Keita joins Akamatsu Industries in a fight against a force they call Algernon.

On the planet Earthdash, its inhabitants gaze on its moon and the technologically advanced lunar city of Mooneyes with awe. Dan JD, a boy living in Rollingtown on Earthdash's surface, gets caught up in Bigfoot Basketball—a fast-paced sport played with giant Bigfoot robots. (Source: AniDB)

In a civilized society of anthropomorphic animals, an uneasy tension exists between carnivores and herbivores. At Cherryton Academy, this mutual distrust peaks after a predation incident results in the death of Tem, an alpaca in the school's drama club. Tem's friend Legoshi, a grey wolf in the stage crew, has been an object of fear and suspicion for his whole life. In the immediate aftermath of the tragedy, he continues to lay low and hide his menacing traits, much to the disapproval of Louis, a red deer and the domineering star actor of the drama club. When Louis sneaks into the auditorium to train Tem's replacement for an upcoming play, he assigns Legoshi to lookout duty. That very night, Legoshi has a fateful encounter with Haru, a white dwarf rabbit scorned by her peers. His growing feelings for Haru, complicated by his predatory instincts, force him to confront his own true nature, the circumstances surrounding the death of his friend, and the undercurrent of violence plaguing the world around him.