Betterman

On the surface, Keita Aono seems like every bit the regular high school kid — his biggest concerns are military trivia and the girls in his class — until his childhood friend Hinoki suddenly transfers back into his life. When he follows her after school, he stumbles into Bottom World, an underground amusement park that was shut down after something horrible happened there. What he finds waiting in the dark is not what either of them expected. That's where things get weird, fast. Betterman is a 1999 TV series from Sunrise that quietly blends mecha with genuine horror — not the jump-scare kind, but the creeping, biological dread kind. There's a mystery at the center of it called Algernon, a phenomenon that makes people turn violent in disturbing ways, and unraveling it becomes the whole point. The show takes its time and rewards patience, building atmosphere the way Ergo Proxy does — slow, strange, and unsettling in ways that stick with you. If you liked the psychological weight of Neon Genesis Evangelion but wanted more horror and less teen angst, this scratches a similar itch. Fans of When They Cry's village-level paranoia will also feel at home with how Betterman handles its sense of dread. It's not a flashy show, and it's not trying to be. It's dark, genuinely strange, and one of the more overlooked entries from a golden era of experimental mecha anime.