These 3L shoujo manga should already be available at your favorite bookstore or newsstand. I got the newbie pair already ^^v

Ikenie no Koiwazurai © Honda Natsumi/Shogakukan [Serialized in Cheese!]
Published in Indonesia as Sacrificial Love Trouble by Tiga Lancar Semesta/3L
Imagine Noriko's consternation when one fine day, Souma, the school terror, orders her to become his “sacrifice.” Sacrifice? Does he mean he wants Noriko to serve him? Whatever that means? But when Noriko shows her reluctance, Souma backs off...and makes a quickie U-turn to “Be mine!”
What will happen to Noriko naww?
Nik sez... More than the main Sacrificial Love Trouble
—which has The Kiss
(^∇^) rushing four pages into the story—this Honda Natsumi antho contains my all-time Guilty Pleasure read, Slight Fever of Snow
AKA Binetsu Snow.
(Even if The Kiss here only hurtles in 11 pages into the story, it's an atsui! French Kiss O(≧∇≦)O) Rui's eager anticipation of cousin Ritsu's visit mutates into panic after she finds out that (1) Ritsu's actually a boy and (2) she, the androphobe, has to share bathrooms live with him!
Needless to say Sacrificial Love Trouble is a GET! on the strength of Slight Fever of Snow
alone. If you're not convinced, however, Honda Natsumi-sensei's second tankou also compiles Goodbye My Love,
I Can't Tell Anyone
and Beastly Boy in the Midnight,
in addition to those two *chuu~*ful titles. All, I suppose, first debuted in Cheese!.
In the mood for even heavier angst? Then check out —
I Can't Stop Loving You by Watanabe Shiho

Gomen, Soredemo Kimi ga Suki
© Watanabe Shiho/
Shogakukan [Sho-Comi]
Published in Indonesia as
I Can't Stop Loving You
by Tiga Lancar Semesta/3L
A month before Valentine's Day, Yoriko promises to double-date with her best friend Hi-chan and her boyfriend. A 2×twosome day in Disneyland should've been fun, fun, FUN! but reality is nowhere near the mark. Yoriko can. Not. Spit. Out! that she and partner Kengo have broken up.
Desperate to keep the truth hidden, Yoriko begs Kengo to pretend to still be with her... at least, until Valentine's Day...
Watanabe Shiho's I Can't Stop Loving You, originally Gomen, Soredemo Kimi ga Suki, also includes Sho-Comi one-shots Hey, Do You Like Me?,
Confession, My 15 Years of Life and You
and Pure Heart Tears.
For other Watanabe Shiho and Honda Natsumi manga, scroll down. Both Sacrificial Love Trouble and I Can't Stop Loving You are Teen or Remaja-friendly. I preview Yokoyama Mayumi's Mature or [DEWASA] rated Galism 4 after the release list.
3L shoujo manga (2011.08.19)
- Galism ~ 3 Sisters first-class Love ~ (Galism - Renai Joutou 3 Shimai) 4 of 6 by Yokoyama Mayumi
- [Premiere] I Can't Stop Loving You (Gomen, Soredemo Kimi ga Suki) by Watanabe Shiho
- [Premiere] Sacrificial Love Trouble (Ikenie no Koiwazurai) by Honda Natsumi
Gomen, Soredemo Kimi ga Suki 「ごめん、それでもキミが好き」
by Watanabe Shiho
Shogakukan Sho-Comi, shoujo
This anthology first published in Japan 2010.07
Ikenie no Koiwazurai 「いけにえの恋わずらい」
by Honda Natsumi
Shogakukan Cheese!, shoujo
This anthology first published in Japan 2007.11
[Release links are hide/unhide. Click for more details.]
¹ Source: Angelzon.com and ME! for cover scans and summaries
² All manga retail for IDR 16,500 each
Galism 4 of 6 by Yokoyama Mayumi

Galism - Renai Joutou 3 Shimai
© Yokoyama Mayumi
Shogakukan [Betsucomi]
Published in Indonesia as
Galism ~ 3 Sisters
first-class Love ~
by Tiga Lancar Semesta/3L
That the Ugajin sisters protect the peace of Manten Academy is no longer news, nor is Nobara's continued single state. What is new is that Nobara enters herself, Ran and Yuri in the Gals contest to restore her loveless dignity. Little does Nobara know that her pride will suffer a greater blow after pictures of the three sisters changing out of their clothes are uploaded on teh internets!
So goes the back cover blurb of the latest High-tension Love Comedy!
Don't ask me who's teh bishie on the front cover; I'm not reading Galism.
Other Honda Natsumi manga
Before Sacrificial Love Trouble (JP Ikenie no Koiwazurai release: 2007.11), 3L licensed Honda Natsumi's Hizamazuite Ai o Chikae (first released in Japan 2008.02; retitled Swear Love on Your Knees for Indonesian release), Hanazakari de Koi Shiteru (JP: 2007.06; Love in Full Blossom in Indonesia) and the 2009.05-vintage Love & Noise!.
So we can still look forward to at least four more standalones: the 10 failed love confessions...and counting! B-kyuu Danshi Gourmet (JP: 2011.01), the angst and paranormal-ridden Shinigami no Torisetsu (2010.02) and the Danger is my business
Kiken na Honey (2008.08).
Honda Natsumi-sensei also collaborated with writer HIMI on the Flower Comics Special Princess about a rich girl who gets engaged to her bodyguard, published 2009.02 in Japan. Her latest tankou appears to be the Teacher/Student-troped ワケありなんです (Wake arina ndesu), slated to release 2011.09.26.
(Yes, I stalk Honda Natsumi-sensei.)
Other Watanabe Shiho manga
Aside from I Can't Stop Loving You (Gomen, Soredemo Kimi ga Suki; JP release: 2010.07), 3L published Yankee Ai wo Chikau (JP: 2005.12), retitling it Yankee Swears His Love. Before that, 3L released Tennen Kareshi Host Shiyou (JP: 2008.07) as Natural Host Boyfriend Method and Sensei to, Watashi to, Hajimete (JP: 2008.10) as Sensei, Me, my first.
Watanabe Shiho-sensei has quite an extensive manga listing — including one-shots, 31 titles, at least 17 tagged Smut.
You can see the list »here. I'm not really drooling for any, so I'll just mention Bye-Bye, Suki na Hito (JP release 2011.01) about a rejected guy who apparently plots to whisk away the girl he loves, the josei Oedo Monogatari (2011.04) and the ongoing Sengoku romance
Hana no Hime Chacha Monogatari currently serialized in Cheese! Zoukan (four volumes as at 2010.12).
Lemme also add these late-breakers: Watanabe Shiho shares top billing with Chiba Kozue in the Sho-Comi Girls' Collection omnibus Osananajimi ja damedesu ka? released last 26 July, and leads the wedding-themed Cinderella-ryū - 16 Virgin Road - antho skedded for JP release 2011.09.26.
Iamque opus exegi,
~niki DBA 30uɐlnɯɐnɥ (花木蘭03)
Mistress of Adoxography
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Galism - Renai Joutou 3 Shimai 「ギャリズム」 by Yokoyama Mayumi
Shogakukan Betsucomi, shoujo
Volume 4 first published in Japan 2006.05