Prison School

Any story. Just looking for a manga that has ridiculously nice artwork in ecchi settings with an emphasis on story. Basically just shy of being Hentai

Nana to Kaoru and its Side Story, Nana to Kaoru: Black Label
Let me know your thoughts when you start reading this Epic Story.

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"Spread your ear-pollution both far and wide" - Billy Squier, The Stroke.

Hantsu x Trash?

That stuff is 60% of my lists
Since your lists aren't visible, dunno whether you've read these:
High-School DxD
Dragons Rioting
KissxSis
Above ones <almost> hentai, below ones not so much but still awesome:
To Love-Ru
Nagasarete Airantou
Gamble Fish
As you said, any story, but ecchi
Here's six, if you need more check out my lists

I disagree with most of the recommendations you were given, except KissxSis and MAYBE Hantsu x Trash.
Why is that? Well Prison School is reall really ecchi, it's Borderline H, and I think that's what you are looking for. High-School DxD, To Love-Ru, Gamble fish are a, lets say, Higher level ecchi but not the ecchi you are looking for.
Maybe I'm wrong and I'm truly perverted to the point I can distinguish ecchi levels.

Chayto

Edit 1: You could also try Nozoki Ana and Nozo x Kimi, both by same author. The first work has sex so it's not like Prison School. Blade Play and Angel (U-Jin) fit into Nozoki Ana's sex topic but well, you might enjoy them.

Last edited by Chayto at 6:14 pm, Dec 1 2013

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"Spread your ear-pollution both far and wide" - Billy Squier, The Stroke.

Nice recommendations, I've read a good portion of them.

Dragons Rioting was a particular delight. Great twist of sexy girls, fighting and comedy.

http://www.mangareader.net/dragons-rioting/10/15

Lol'd so hard at the evangelion reference

And yes... Prison school was so borderline H that I was actually ANGRY that when I came here to look at works by the same artist, there wasn't a history of fantastic H series he'd done that I could download. It's a crime to be that good and not use it!

Glass no Megami - almost to the point that some of the ecchi angles looked real !

Velvet Kiss
To Love-Ru Darkness -little story atm
Toshiue no Hito
Kono S o, mi yo!
Happy Negative Marriage dropped
Itoshi no Kana
Kimi wa Midara na Boku no Joou
Koi wa Misoji o Sugite kara
Koibana Onsen mediocre story
Oretama epic

All of these have some measure of nudity, and most have sexuality in it.

That manga is porn, simple censored porn. You read the first 3 chapters, around 20pages each make a total of 60ish pages which 40 are porn.
Erotic Ecchi is not porn, in Nana to Kaoru and Prison School there's N O sex.

________________
"Spread your ear-pollution both far and wide" - Billy Squier, The Stroke.

IMHO
Aiki
Haru yo, Koi
My Mysterious Girlfriend X
High school of the dead
Earth Girls
High School Planet Prowler
And maybe most from these fit your criteria?
https://www.mangaupdates.com/series.html?category=Borderline +H