I want to read a manga with this kind of concept...

>>> the main character girl/boy is not interested in love or any romantic relationship.. he/she is focus on other things... he/she wants a simple life... yet he/she is popular...

then here comes a girl/boy who will mess up his/her simple life.. he/she will always be with her/him because of uncontrolled circumstances (ex. partner in a school project.. blah blah..) and will always be in trouble...

then, he/she will realize how the other character will change his/her life.. then he/she will start to fall in love to that 2nd character...


*haha.. i don't think there's a story like this...*

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stop dreaming... start working!

kareshi kanojo no jijou

perhaps?

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Need a loving and lovely tsundere wife, anyone interested? >.<

On second thought yandere would also be fine.... O.O

Take the Magic: The Gathering 'What Color Are You?' Quiz.

Oresama Teacher maybe..

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Karin

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Sora no Manimani

perhaps

Id' go with Toradora! except for the fact the he has already someone he likes at the start of the story.
I think also Suzumiya Haruhi no Yuutsu is quite similar to what you want (but I suppose you already know about it), except the fact that he is not so popular at the beginning.
And maybe DearS.

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What I like in Trivial Pursuit style. Pick your category:

Maybe Special A.

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If you've ever thought or said "Nice Guys finish last" and really meant it, then you should probably read this LJ post by DivaLion. It's incredibly insightful whether you're male or female.

From a bumper sticker I like:
"If you're gonna ride my ass, at least pull my hair."

What you describe reminds me a lot of Nodame Cantabile, although the boy did have a girlfriend before, so it wasn't as if he was totally uninterested in love.

Shiawase Kissa Sanchoume might also fit.

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Avatar by tassyn.livejournal.com

Reading: Kingdom, Sangokushi, Historie

Beauty Pop? O_O..

maybe
Show Me the Money
Iketeru Futari
midori no hibi
there is Rape, I don't think it is what you are looking for but kinds of fill that description


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Tenshi Ja Nai! maybe

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[Url=http://goo.gl/WMSVJ] k'><u>Looking for... shoujo with a canned peach confession.</u></a><!--url_type_2_end--><BR><!--url_type_2--><a href='<!--Auto_parse_begin--><a target='_blank' rel='nofollow' href='http://www.antimoon.com/how/pronunc-soundsipa.htm''><u>http://www.antimoon.com/how/pronunc-soundsipa.htm'</u></a><!--Auto_parse_end--> target='_blank'><u>Don't English Me I'm Panic</u></a><!--url_type_2_end--><BR><!--url_type_4.5--><a href='<!--Auto_parse_begin--><a target='_blank' rel='nofollow' href='http://www.mangaupdates.com/showtopic.php?tid=3839'><u>Guess'><u>http://www.mangaupdates.com/showtopic.php?tid=3839'><u>Guess</u></a><!--Auto_parse_end--> the Manga/Anime Name</u></a><!--url_type_4_end--><BR>'Shojo manga has no boundaries, and never did!’ -Shimizu Reiko, Himitsu - Top Secret fanbook interview

Itazura na kiss
Gokuraku Seishun Hockey Club (kind of..)

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♥♥