Having grown up myself in the 80s, this manga definitely was full of flashbacks, both good and bad. The art style is standard for the times, and honestly is better than some of the work we see today. Back then, there were no computers to ease the process, and manga had nowhere near the support and popularity it does today. I see recent manga made in recent years that have a "slapped-together in 20 minutes" quality like it just came out of a sketchbook, so you can't really come down on KOR too hard. Not to mention, you do see progression in the quality of the characters and artwork over time (although the side characters seemed to still be kinda sketched-level).
As to the story, having read many other mangas prior to this, it was kinda like reading a storyline in reverse with inverted flashbacks. I spotted chapters here with plots that I've read from other more current mangas like I"s and Ichigo 100% (which I saw the most parallels from).
I had to chuckle a bit that the ending scene of Ichigo 100% is almost a complete copy of this one, even down to the scenery, stairs and all...no hat but still, she went away, came back and he comes running up steps...hmmm
To say this manga is the baseline for many successful 'current' mangas is an understatement, using almost every trick in the book that we now consider 'gimmicks' or cliches. Definitely a classic
While the character's wishy-washy nature is a bit annoying at times, it's that whole "noble klutz" bit and it's kinda hard to be mean to him. The one thing I will say that detracts a bit from the manga is that the overall story development never seems to go very far, with a fair amount early on, then kind've a "coasting mode" till the last volume. Regardless of that it's still a fun read, with his ESPer powers playing a big role and leading to some truly unique situations. Luckily his powers are not the driving force of the manga, more like the punchline...just about every serious issue is solved in a (fairly) normal manner. To my relief, the ending didn't feel all that rushed, taking up most of the last volume....almost expected to see a 1-2 chapter rush.
Not a manga for those that like the serious "let's spend 10 pages every other chapter reading about the protagonist psychoanalyzing himself" love triangle romances, but great if you like a light-hearted approach with a nice chunk of slapstick tossed in.
(couldn't give it a 10 due to the slow progression, but great overall regardless...the artwork barely gets in the way)