YU-NO

These eroge adaptations are quite the surprise. The surprise being that they're supposed to be hentai OVAs, but you're not going to watch them for the hentai. No, you're going to watch them for their plot- no capitalization needed. They're quite "bizarre," and you'll certainly have an better experience if you're familiar with their source material. That's not to say that it'll be any easier to understand whatever is going on in these OVAs.