My enjoyment for these could've been much better. Perhaps because the last Sekai Ichi thing I watched was the movie, which was basically my favorite yaoi anime/movie/ova I've watched, this felt underwhelming. The stories didn't feel entirely complete to me. They left me wanting more, but in a "this is missing/lacking more than I care for" kind of way.
The first one was really, really adorable and sweet. And the parts that weren't present time were fantastic. If it focused only on their high school days, I probably would've given it a much higher score. I feel like this OVA would've been better if it either did that, or was more than one OVA so it could successfully pull off going back and forth.
The second one was... mild? Not boring, but not interesting. I guess mediocre is the best way to put it. Again it felt really like it was lacking/missing/incomplete.
Don't think I'm just expecting too much out of OVAs... because I've liked other OVAs. I liked the OVA I watched for Junjo Romantica, for example. Was it a waste of time? No, I wouldn't say that. But I also wouldn't go out of my way to rewatch it, either. It probably doesn't deserve an overall 7, but I do like the art, sound, characters, and /parts/ of it.