Soreyuke Marin-chan

In futuristic Japan, a doctor decides the best way to preserve the nation's future is to collect semen from 100 exceptional men. That's the actual premise, and it commits to it completely. Marine Nonohara is a cheerful, oblivious student from an all-girls school who gets drafted into this mission by her scientist sister, Dr. Narutaki. She's given a magic ring, a shape-shifting costume that adapts to whatever a man finds attractive, and a pink turtle-shaped robot named Pon-chan whose job is to handle the, uh, collection — keeping Marine technically uninvolved. It's absurd in the best way. Then a rival scientist builds a sex android called South Pole One to complete the mission first, turning the whole thing into a race. The tone lands somewhere between magical girl parody and straightforward hentai, leaning into the comedy of the setup without apologizing for the explicit content. Directed by Masami Obari, known for his stylized animation work, the series has a visual personality that keeps it from feeling cheap. If you've seen something like Mahou Shoujo Ai or La Blue Girl and appreciated how those blend genre parody with adult content, this fits that same niche. It's a 3-episode OVA from 2001, so it's short and doesn't overstay its welcome. Go in expecting something genuinely strange and occasionally funny alongside the explicit material, and it delivers exactly what it promises.