The Legend of the Blue Wolves

Humanity's push to spread across the solar system sounds like progress — until something wipes out the entire colony on Pluto. The culprits are the Apocalypse — alien invaders who harvest human brains to power their giant mechanical bodies. Humanity's answer is its own mech program, and that's where Second Lieutenant Jonathan Tyberius comes in, fresh into an elite military training unit and rooming with a guy named Leonard Schteinberg. Their bond is the emotional core of the whole thing. But here's the part that makes it more than a standard mech story: the deeper they get into training, the clearer it becomes that the corruption inside their own military might be just as dangerous as the enemy outside. This is a single OVA from 1996, so it's short, dense, and carries that raw, unpolished energy that mid-90s animation does really well — think grainy textures and dramatic lighting before everything went digital. It sits in a genuinely rare genre overlap: mecha and Boys Love, which puts it in conversation with titles like Ai no Kusabi or Zetsuai 1989 if those are already on your list. Fair warning — this is hentai, so it's explicit, and the content gets dark in ways that go beyond just combat. If you want something brief, weird, and willing to go places most sci-fi mech stories avoid entirely, this is worth the single episode.