So for long time I have been looking for a really romantic long (more than 5-10 chapters) manga. My all time favorite is Crimson Spell followed closely by Junjou Romantica. Here are some I have already read ranked by how much I loved them!!!

Crimson Spell
Junjou Romantica
Sekaiichi Hatsukoi
Yellow
Yume Musubi

I have read hundreds more than this but can't remeber all the names and will take way too long to type them lol!

*And I have read Viewfinder and Okane Ga Nai and they aren't my favorites. I am not really a fan of really girly ukes like in Okane Ga Nai nor rape like in Viewfinder!

Moved to Yaoi/Yuri.

You can try Complex by Manda Ringo. It's probably one of the most unique yaoi mangas I've ever read and it's about 4 volumes. Don't let the first chapter scare you off though. =]

Here are a few others I thought were pretty good. =]

Koisuru Boukun
Little Butterfly
Kusatta Kyoushi no Houteishiki
Kizuna
Border
Skip Kiss
Chintsubu
Saa Koi ni Ochitamae

I have to mention Acid Flower because I consider it on par with those famous longer series. The only downside is that it was discontinued. :c It's still definitely worth reading.

Feng Yu Jiu Tian (Novel) certainly~

Love Stage!! - Best Ever! A I love these mangaka's style.

Michiru Heya - Very interesting, and sweet.

Umi ni Nemuru Hana - So good! They need to update this! DX

I second Complex. Its main genre feels more like seinen than romance, but it's pretty good.

Semi-long good ones:

Bukiyou na Silent

Calling (OTSUKI Miu)

Miwaku no Ringo

Count

Sex Pistols
Katekyo!
Kawaii Akuma Itoshii Akuma
Koi no Tsumeato
Ano Hi no Kimi wo Dakishimeta nara

never fr0wn cause you never know whos in love with your sm 🙂 e
Your mind is like a parachute it works best when its open

Kimi ga Koi ni Oboreru 3 Volumes
Totally Captivated - never read it myself but heard from many people that it's great!

[img]http://i1203.photobucket.com/albums/bb395/xXTsukiXx/26852202_zps6e5cdbef.jpg[/img]

**Totally Captivated **

you must read it !!!!!!!!!!
AMAZING 🙂

totally third totally captivated
and you could also try yatteraneeze!

I second Bukiyou na Silent and Kizuna, and suggest Love Mode- it's pretty long, and the stories are amazing. It takes a good amount of chapters to get into it, but then it gets GOOD. 😁 Dog Style was pretty good, also.

boop.