O-parts: Oman

What starts as the usual drama of classes and cliques quickly turns to chaos when someone unearths a mysterious mechanical relic buried on a prestigious all-girls' school campus. These things are called O-parts — remnants of some ancient civilization that nobody fully understands — and they have a habit of doing wildly unpredictable things when the students try to mess with them. The setup is pure comedic chaos: ordinary school life colliding with bizarre ancient technology that nobody asked for and nobody knows how to handle. Being a 1987 single-episode special from Studio AWAKE, the animation carries that distinct late-Showa aesthetic — chunky lines, vivid colors, and the kind of hand-drawn texture you just do not get anymore. The mecha elements here are not giant robots punching each other; they are woven into something far more absurd and comedic, which makes it a genuinely unusual combination for the era. If you have already worked through titles like Mezzo Forte or La Blue Girl and want to trace the weirder corners of late-80s adult animation, this sits in that same general neighborhood. It is a short, strange artifact from a very specific moment in anime history — the kind of thing that exists mostly because someone had a weird idea and the freedom to execute it. At one episode, the time commitment is negligible, and the novelty factor alone makes it worth a look for anyone curious about how eclectic that decade really was.