Adventure Kid

While digging in his backyard, Norikazu unearths a World War II-era computer, powers it on, and immediately gets sucked into Hell with his friend Midori. That's the setup, and it only gets stranger from there. The underworld they land in is packed with monsters, demons, and all manner of creatures — and the show leans hard into its adult horror fantasy tone without much apology. Down in this realm, they pick up a couple of unlikely allies: Eganko, a seductive elf-like woman who takes a liking to Norikazu, and a lecherous monster prince who ends up under Midori's thumb. The dynamic between the four of them is genuinely weird in a way that works — equal parts danger and absurdity. The whole thing has that gritty early-90s OVA energy where the animation is rough around the edges but the atmosphere more than compensates. If you've seen Urotsukidouji: Legend of the Overfiend or La Blue Girl, you know the exact flavor of dark erotic horror this era was producing — Adventure Kid fits right in that same vein. It's also spiritually close to Demon Beast Invasion in how it mixes genuine threat with explicit content. Three episodes, based on a manga, and it does not waste your time with setup — it drops you straight into the chaos and keeps moving.