Fuuko is a normal high school student who went after a boy whom she thought had something "special" about him. Turns out that the guy had a "super" power that lets him control how gravity affects him. However...it seems that it can also affect other people!
Last volume includes a sidestory called H²Love.

From Nagareboshi Manga:

Yui has a deep love for her "older brother" (they're not actually siblings, but are related), and she is devastated when he gets married. While at the wedding, Yui meets a sobbing boy, Kaoru. It turns out that his cousin (that he was in love with) is the one Yui's brother is marrying.

When Yui moves into a boy's dorm so she can seek out new love, she finds that the head of the dorm is none other than Kaoru!

Bekku Nanaki is mirror clairvoyant. She moved to Tokyo from the countryside to escape calamities she sees. There, she witnesses an accident on the road caused by a mobile fish vendor, who saves her from being crushed by a billboard that falls from above.

The next day, he turns out to be Banjou Kizaki, her classmate and a student held back due to his involvement in incidents and accidents that others attribute to his being unlucky. His eccentric behavior, however, catches her attention, which he explains as changing the future...

From Intercross and Divine Sanctuary:

1) Animal Jungle
Her mother has decided to remarry. Sumi suddenly has to live with three handsome brothers, Amane, Midori, and Hitomi. She wanted to have a happy family, but the house has become a dangerous animal zone. Fighting dangerous situations everyday…?!

2) Saikyou Venus
Aoi is a weak girl... A REALLY, REALLY weak girl. One day, on the roof, she was about to be "attacked" by some perverted guys until suddenly, the strongest and most feared guy in the school (Tatsumi) comes crashing in... covered in the blood of the two half-dead guys in his hands!! The boys run away, leaving Aoi behind... and she faints. The next day, there's rumours going around that... Aoi is Tatsumi's girlfriend!?

3) Ultimate Bishie Paradise
Sachika has always found Mitsuki-kun to be an unbelievably perfect, ultimate bishie. Thus since because of this perfection she finds herself victimized every day which in turn makes her declare to Mitsuki that she will reveal his true colors!!!

4) Oshaberi na Sympathy
After Asahino bumps into Kira they can hear each others thoughts. How can they change this back?

Fateful Encounters:
Tsunayoshi is Misao's big brother, though they're not related by blood. He used to be a juvenile delinquent, and his love for his little sister is constantly embarrassing Misao. Yet he's a good guy who will do anything to protect his little sister.
A powerful and dangerous brother x sister love battle begins!

Maachi is a 15 year-old girl who loves her brother Riichi. Actually, the two of them are not related by blood, but due to their parents work situation they are forced to live alone together. Riichi, whose looks, personality, and grades are top-class, is the idol around school. But he has a huge secret that only Maachi knows about. Riichi is actually an otaku!

Four cute school romance stories, all having some sort of time theme. In the first story, a girl discovers she can freeze time. In story 2, a girl discovers she can communicate with a boy living 6 years in the past through notes written on her desk. In Story 3, a girl finds herself living the same day over and over again (like the movie Groundhog Day) and finally, a girl who has a crush on a boy 3 years her junior discovers what the world would be like if he were the one who was 3 years older instead.

In a high-tech world, Boris finds out that his cute classmate Yuri Angel has created a robot that looks JUST like him! Annoyed by the robot's resemblance, and by its creator's lack of emotion, Boris hides the automaton in his room and sneaks into the Angel residence… pretending to be the robot itself. But once he succeeds at the bizarre ploy, how does he get out of it?

From Viz: Everyone thinks 16-year-old Ryoko has weird taste in guys because she can't stop drooling over Ryu, the strong silent type who sits next to her in class. When she discovers he works for a host club--where women actually pay men to date them--will she finally wise up? Only one thing's for sure in B.O.D.Y.--you can't put a price on love!

Yamada has one goal when she enters high school.: She wants to sleep with 100 guys. But she's got one small problem: She's a virgin. Afraid of being rejected or ridiculed by hot or experienced guys, she decides that in order for her to reach her goal, she first has to do "it" with another virgin. While in a bookstore, she bumps into an average-looking boy (named Kosuda), and decides he's the perfect candidate. Will Yamada succeed in getting Kosuda to bed, or will something more bloom from the not-so-innocent start to their relationship?

To celebrate the 10th anniversary of Azumanga Daioh, the manga is being repackaged into a new three-volume set, which will include three chapters of new material called Supplementary Materials.

Each new chapter covers one year of high school, with all new adventures for Sakaki, Yomi, Tomo, Chiyo, Osaka, and Kagura.

Yousuke and his sister were orphaned at a young age. Yousuke's sister was adopted ten years before the start of the story, since then, he has been looking for her.

One day Yousuke found the couple that adopted his sister, the problem is that they have two daughters, Ayu and Mayu, both of which were adopted from the same orphanage and are roughly the same age. Both Ayu and Mayu had an older brother before being adopted.

Things get more complicated when Yousuke learns that the orphanage where he previously lived was burned down a year earlier, destroying all the records, and that the couple's own records have disappeared. Yousuke must figure out which one of the girls is in fact his sister.

Tenma is a Middle Schooler who loves playing Mahjong. He doesn't know exactly why, but the freedom it brings him fills his chest with pride. One day, his friends run into some trouble with University Students from Kantou, and it's up to Tenma to save the day!

It also has 1 Volume (Collector's Edition) called "Tetsu to Tenma" (Including "Atsuize! Tenma" and "Burai na kaze Tetsu" in a single volume).

From Keijo Shoujo Scans: Haruko Nanase wasn't always the brightest student, but through sheer hard work she successfully entered a prestigious high school and is at the top of her class. While riding the train one day, she witnesses a fight involving a guy wearing the same uniform as her. When the fight is over, he demands that she pay him a fee for watching it but she escapes. The escape is not to last though, because the next day the guy turns out to be in the same class, and worse, his seat is next to hers.

Yoichi Karasuma has spent all of his life in the mountains, training in the Soaring Wind, Divine Wind swordsmanship style. Under his father's guidance, he is able to master the technique at the age of 17. With nothing left to learn, Yoichi is sent to a new dojo located in the city so he can continue to train and gain an understanding of modern society.

Unfortunately, Yoichi has no idea how to act or speak to anyone in the present day and acts like a samurai, complete with odd speech and traditional clothing. As he goes to live with the Ikaruga sisters Ayame, Kagome, and Chihaya, at the dojo, Yoichi, clueless on how to interact with others, is constantly hurtled in hilarious misunderstandings.

1) Ren'ai Han'i 1%
Kagami and Fukamachi are two friends who both secretly love each other, but the other doesn't know it. Then one day, Kagami tells Fukamachi that he's interested in his sister Lisa, upon which Fukamachi then reluctantly decides to take Kagami home to see Lisa. Now Kagami is faced with showing Fukamachi how he feels before he's forced to go out with a girl he doesn't love...

2) Asobi ja Nai no
Continuation of Kagami and Fukumachi's new relationship.

3) Urahara na Koi
Kyouya, a socially awkward college student has trouble smiling and gets bullied at school. What happens when he stumbles into Akira (a high school student) when he's out drinking?

4) S ni Ochita Seinen
Kyouya (not from chapter 3) is in love with Shirou, his business partner, but Shirou already has a lover?!

5) Don't Worry About It!
Ryuusei has for a long time been in love with the carefree and friendly Nagisa, who on the other hand is oblivious of Ryuusei's feelings for him. The day comes when Ryuusei has had enough and confesses to Nagisa by giving him two options, to become his lover or stop all contact with him. Now, what will Nagisa do?

6) Amai Koto Shitai
Although Otonashi's first impression of Tonozaki-senpai was "horrible" when they first met as members of the students' council, their relationship soon alters through time after their involvement with each other.
(Story setting is the students' council from Warui Koto Shitai)

7) Asobi ja Sumanai no
(Ren'ai Han'i 1% and Asobi ja Nai no omake)

From vyc at MangaHelpers:

In the Ben-to series:

V.1 - Ben-to Zero: Road to Witch
Bargain hunters seek the best deals and compete against each other to obtain the product on sale. Yarizui Sen, who just moved into town and started living on her own, is introduced into the cutthroat world of bento bargain sales.

Near closing time, supermarkets put unsold bentos, prepackaged meals, on sale and hungry competitors who call themselves wolves fight against each other to see who gets the right to purchase the delicious and cheap meal. Sen learns under the most feared competitor of the town and trains to use her hunger as a source of obtaining the half off bentos.

V.2 - Ben-to Another: Ripper's Night

V.3 - Ben-to: À la carte

From Blissful Sin:

During the last summer holiday of high school, Chinatsu, who has been scared of sex ever since he had his heart broken, decides to jump into the arms of Charles Yamazaki, who is said to be a Love Counsellor that can bring one out of one's pain no matter how terribly one's heart has been broken.

From Viz:

Although a truly gifted hairstylist, Kiri Koshiba has no interest in using her talent to pursue fame and fortune, unlike the three popular boys in the "Scissors Project" at school. Determined to become the best makeover team in Japan, they give showy makeovers to handpicked girls. As much as Kiri tries to shy away from the Scissors Project spotlight, she finds herself responding to beauty's call...

Note: Beauty Pop Stage 2 is from volume 7 to 10. It is a continuation of Beauty Pop. This is because they were published after the hiatus. The whole series ends with 10 volumes.

When bubbly eleventh-grader Eimi Yamashita finds out that her parents are relocating for work, she decides to strike out on her own and move into a dormitory for girls. Little does Eimi suspect the exciting romantic adventures that await her there! Eimi's fellow residents are a little bit crazy but a whole lot of fun. They've got a secret mission planned for Eimi's new resident initiation...and it has something to do with sneaking into the boys' dormitory across the street and returning with a special keepsake! Can Eimi pull it off without getting caught by one of the handsomest (and cruelest) boys in the dorm?