Hello, I'm feeling pretty down and I'm tired of stories that have sad endings, I need something with a happy ENDING, and by that I mean one that isn't "could be considered happy", but is actually a "happily ever after" ending. No tragedies (some stories like to kill off characters you really really start to like halfway through the story, no-likie) If it's a romance then it'd be nice if it was at least an Adult or Drama type, but preferably not your typical same-story-over-and-over-shoujo. Other than that it can be any kind of story, Fantasy, Romance, whatever.

Side note: To make it a little clearer with the happy ending, it's okay if it has a sad story all the way til the ending, just as long as the main characters don't die / brain death / cursed to sleep for eternity etc.

Other random thingies: 6+ volumes, doesn't have to be finished, adult / incest is AOK, no ecchi unless it has a mature story, if it is a Yaoi or Yuri please make a note (I personally do not like Yaoi, however some people looking through this thread might, so... Yeah...)

I think Love Lucky will fit.

Rockin' Heaven
Get Love!!
It's Love
Love in the Mask a lot of drama in this one

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Nulla in mundo pax sincera
"Always go too far, because that's where you'll find the truth." - Albert Camus

One story that I always recommend to people in a slump (or just in need of something lighthearted) is Husky and Medley it's short, only 7 chapters, but it's based on a true story and it's ending is pretty happy imho (the real life girls are in college today and are actually still together). Yeah, it's yuri. I know of some others but this is the one that always occupies my mind when "happy story" comes up.

Mahoraba

It still has probably the best ending in a manga I've ever read.

there all shoujo but don't follow the story line of most normal shoujo's where you can predict what is going to happen a mile off.
Mars it has a rather happy ending and is a good read
Kare First Love
Bijo ga Yaju (aka) Beauty is the beast is also shoujo but has really, and i mean, really wired characters so it does not follow the same story line as normal ones do.
I don't know wether you are interested but Fruits Basket is really good and has a super duper happy ending.
Last, but definately not least Hot Blooded Woman is a romance with a really happy ending, it is also very funny

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We work in the dark, we do what we can, we give what we have, out doubt is our passion and our passion is our task, the rest is the madness of art. Henry james

Hanako to Guuwa no Tera keeps being interesting until the end, and is quite satisfying

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in need of romance?
uncommon, sad, sweet

From Far Away is cute and sweet all the way through, I'd say.

Full Moon wo Sagashite has a happy ending for every one of the characters.

Gokusen is a funny and hilarious read.
Also , I think Lovely complex can be considered as a happy story.

Incorrect! Hoshi no Samidare has the best ending EVAR! But I see you've read that already.

Seriously though, Mahoraba is good. I think Change 123 has a similar ending, but is more ecchi if you're into that.

Chobits has a semi-bittersweet ending, but still good.
Emma has a great ending (read to the end of Volume 10, the "extra tales")

Umm what else... Ai Yori Aoshi perhaps?

Lilim kiss has a happy ending. As does usagi drop

And I don't agree that mahoraba was happy... quiet magician girl should have become the main TTT-TTT

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Few favs
Comedy:
Kyou kara ore wa!!, Mx0, Angel Densetsu, Skip Beat, Ai Kora, The Devil King is Bored

Romance:
Hana to Akuma, No bra, Shinigami Trilogy, kindan no koi de ikou, Usagi Drop, Threads of Time, Girl Friends

Most under rated:
Kindan no koi de ikou, kyou kara ore wa!.
m0r l83r... maybe >_>

you could try Onegai Teacher

It's a spoiler pretty much Boku no Hatsukoi o Kimi ni Sasagu

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"I'll shut your mouth~~~~~ with mine~~~"

二息歩行

Special A
Lovely Complex
Ouran High School Host Club
Skip Beat
Cat Street (over coming challenges)

Are some really nice original shoujo mangas that have plenty of smiles, although Skip Beat is the only ongoing series from the one's I've listed, its a really good read.

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High above the tree tops.