Tenkousei

Tatsuya Tagami, a transfer student arriving at Hakuka Co-Ed Academy, carries one of the most absurd goals ever put to animation, scheming to impregnate all his female classmates as part of some hare-brained world domination scheme. The school recently went co-ed after being girls-only, so Tatsuya is essentially a fox walking into a henhouse, except the fox thinks he's a mastermind and everyone around him has a distinct personality that complicates his ridiculous plans. The tone leans comedic — this isn't a brooding, serious adult title. Tatsuya's schemes play out with a kind of bumbling confidence that keeps things lighter than you'd expect given the premise. The 90s art style from studio Horannabi has that soft, dated charm you either love or feel nostalgic for — thick lines, warm colors, and character designs that feel distinctly of their era. It's a 4-episode OVA from 1996, so it moves fast and doesn't overstay its welcome. If you've watched something like Bible Black and wanted the tone dialed way down toward self-aware silliness, or you enjoy adult OVAs from that mid-90s window where comedy and explicit content were frequently mixed, this fits that niche. It's not trying to be Kimi ga Nozomu Eien — there's no emotional gut-punch waiting for you. It's a deliberately goofy adult romp that knows exactly what it is and doesn't pretend otherwise.