Working sorta fits your requirements, I guess. It's definitely more of a comedy show, and the (two) romances aren't the most important thing, but there's definitely closure. And while they aren't all adults, it does take place in the workplace rather than in a high school.
"El Psy Kongroo!" Hearthstone Moderator
Sadly all I see is stuff that probably doesn't meet your requirements closely going by "unique to panda" list but I'll throw them all out:
Finish shakugan no shana's second + third seasons....Light amount of "true" romance but for most people who watched it found the pay off very good (close to toradora but since it's split into 3 seasons it feels much better imo)
Tsubasa chronicle, don't need to say anything about this really
Rakuen Tsuihou, movie length and not really romance, but I enjoyed it in a different way and figure you might enjoy a short one
papa no iukoto wo kikinasai....probably not something you'd enjoy and the "true end" is in the OVA
Question: does the DH starting quests or their class hall have any cute girls
I can't decide whether to make a female or male. If there's cute girls involved, I'll definitely have to make a male for self-insert purposes
Ehhh. Tsubasa Chronicles is nice but it's also a heavy heavy 'read source material' which wouldn't be hard since the manga is completed now. It is a damn good watch though, full of great story and music. I still gotta stick to Itazura na Kiss though. It's all about the romance that he's looking for.
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Make a girl for lesbian self-inserts. It'd be better.
I just died IRL
Did you already reach the point where it went: That the child of light and shadow shall defeat the legion? I really thought it was about priests cuz you know, it has light based specs and shadow. But it turned out to be about Illidan. I went all 'NOOOOOOOOOOOOOOOOO' irl.
Cute cat girl from Yozakura Quartet
http://i.imgur.com/CKsCOC0.png
"Would you please let me join your p-p-party?