Betterman

Keita Aono leads a typical high school life filled with discussions about military technology and the dynamics of his classmates. His world takes an unexpected turn when his childhood friend, Hinoki Sai, transfers to his school. Excited to reconnect, Keita's plans quickly spiral into chaos as he inadvertently stumbles into Bottom World, an eerie underground amusement park that was shuttered after a tragic event.

In a shocking twist, Keita discovers Hinoki inside a mysterious robot, where she is working with Akamatsu Industries, a company collaborating with the enigmatic organization Mode Warp to probe into bizarre incidents of violence across the globe. Together, they must navigate the menacing attractions of Bottom World, which have inexplicably come to life and turned hostile. Their fight becomes even more complicated when a powerful entity known as "Betterman" enters the fray, leading Keita into a battle against the enigmatic force referred to as "Algernon," as they grapple with the true nature of their adversaries and the technology surrounding them.