From asdf scans:

A bunch of love problems surround her life. Futamura Umiho is a girl with a weak personality. A new flower is about to bloom! A fresh and inspirational story is blooming. A love between flower and thunder!

As a child, Kasama Ryuuji watched his parents killed before his eyes by the rival, Yazuka gang. As a teenager, he finds the woman who raised him after the death of his parents, raped and murdered by the same gang. With the lost of his loved ones, Ryuuji wants nothing more to do with the Yazuka. When everything seem lost, the kind and caring, Araki, who claims to be the brother of his adoptive mother appears. Ryuuji develops a special bond with Araki but how will Ryuuji react when he learns that Araki, in fact, is the only surviving member of the Kasama gang, who has devoted his life to protecting Ryuuji. Will Araki-san, the dragon, be able to keep Ryuuji safe, or will his enemies use the young man as a pawn against him? (from MegKF by Rogue11)

NOTE: Each Hana to Ryuu Soushuuhen volume compiles 4 doujinshi volumes.

Hana to Ryuu Soushuuhen 1 (1998)
#1 Chiri Isogu Hana
#2 Hei no Naka
#3 Ryuu no Tsume
#4 Futatsu no Saikai

Hana to Ryuu Soushuuhen 2 (2000)
#5 Shinjitsu wa Yami no Naka
#6 Yomigaeru Akumu
#7 Mienai Tobira
#8 Ryuu wo Karu Mono

Hana to Ryuu Soushuuhen 3 (2003)
#9 Hebi no Rasen
#10 Kienu Juujika
#11 Karamiau Kizuna
#12 Tsuki ga Michiru Toki

Hana to Ryuu Soushuuhen 4 (2006)
#13 Kaiko to Zouo
#14 Kioku no Kakusei
#15 Aizou no Yukue
#16 Hebi no Doukoku

Hana to Ryuu Soushuuhen 5 (2007)
#17 Ai to Yami no Hazama de
#18 Yume no Mahoroba
#19 Matoitsuku Bourei
#20 Tamashii no Doukoku

#21 Tomurai no Hana (2009)
#22 Kibou no Akari (2009)
#23 Tabidachi (2010)

At a house with blooming Japanese Stewartia, the one Natsumi meets is…?

1-3) Hana to Usagi
Our delivery service's regular customer, Aizawa-san in room 411, is always wearing a rabbit head… Why is he wearing something like that in the first place? Pervert? Everyday he sends or receives delivery but you can’t see his face, and he’s almost mute, there’s nothing scarier than this. But one day, still wearing the rabbit head, he grabbed tightly onto my arm, “T-thank you, I’ll see you again tomorrow…” Saying it in such an embarrassed way- My heart beats so fast.

Extra - Actually I thought of a good way

4) That Smile Once Again
Fujimura is a talented pianist who refuses to perform in the school's culture festival despite the student council president, Segawa, trying to convince him daily. Why won't Fujimura perform? And why does Segawa keep on pestering him?

5) Greatest Common Denominator
Tatchan and Shouhei are in a relationship. Shouhei wants to ramp it up to the next level, but Tatchan seems hesitant. Is this love just one-sided?

Some time before the June of summer. One day, she suddenly died...

"I" and the corpse of the girl who should have died, "Makoto", spent those false summer days in that apartment.

The relationship between these two sad, distorted people slowly becomes clearer...

From Aerandria Scans:

I’ll sing this song for you in the garden… so come and listen to the song while gazing at flowers.

1. The Flower That's Sacrificed to Pure Love
At the mansion where his father worked as a gardener, young Daniel met Tsubaki, who was destined to become a "Hana", an official prostitute that serves only the royalty and nobles. In order to have Tsubaki, Daniel went to England to further his studies, and eventually won the highest accolates for a gardener. Coming back to his motherland, Alexxa, after fifteen long years to receive his peerage, he finds that... -From Blissful Sin

2-4. The Flower That Blooms in Pure Love
Katsumi accompanies his boss to a brothel, but always waits outside. One night he meets Shrill, a young boy who lives in the brothel, although he is not yet a "Hana". Soon they begin to develop feelings for one another... but of course there is a problem. In Alexxa, the "Hana" only serve those with noble blood from their country, and Katsumi is from the Japanese embassy. How will they keep their love?

5&6. The Flower That Blooms in Reminiscence
When Iris's master dies, he is left as part of the inheritance to the master's son Leonard. The late master raised Iris with kindness and love... but Leonard hates the "Hana" system. Iris is left in the hands of a man who hates him... but why did Leonard embrace him?

7. The Flower That is Blooming in Blissfulness
Extra to Chapter 1

8. The Flower That is Loved Forever
Short story - Skipped

9. Imitation Gold
Two noblemen, pride, love, and money.

10. Deer Hunting
Continuation of Imitation Gold

From Evil Flowers:

1-3) Hana wa Knife o Mi ni Matou
Kako Saeki is a senior in high school. She has been modeling and harboring her love for her favorite art teacher, Enjoe. Her heart breaks when she finds out that her love is actually engaged. Now, Kako's innocent love takes a dangerous turn when she finds out who he's engaged to...

4) Yori-chan's Feelings
An insight of how Yori-chan, Kako's big sister, is thinking.

5) Beautiful World
Near the Ipson village, if you venture into the forest, you’ll meet a lonely demon. If he talks to you, he’s going to tell you your fortune, but don’t expect it to be something good. This demon has been named by the villagers “the insulting fortune teller”. One day, a beautiful red-haired girl named Alice becomes this demon’s friend. He doesn’t want to look into her future, but he might need to…

Mori and Ayumu are a gay couple in college in a happy relationship. However, after Ayumu prays at a shrine for them to always be together, the shrine's deity intervenes by turning him into a girl, and now everyone except for them think Ayumu has always been a girl.

A delicate short series about the relation between love, sexuality and gender.

Overworked, still single, 38-year-old salaryman Sakurai Kazuaki collides with a young man at the train station - causing the magazine he was carrying to be spoiled. This young man, Minagawa Youichi, is a student at an art college and lives in a big, old-fashioned mansion with two of his cousins. Since he happens to own the same magazine, he takes Sakurai to his house, saying "If I trade my copy with yours, you'll have nothing to complain about, right?"

Despite feeling annoyed and frustrated by the unsociable Youichi's arrogant behaviour, Sakurai soon finds himself a frequent visitor of the secluded household, inexplicably drawn to its enigmatic owner...

Hana, who lives on Tonaki Island, a small island with a population of 600, loves reciting so much that she holds public reading sessions for the children of the island. Mizuki feels that Hana's "reading" has the power to attract people, and invites her to join the broadcasting club, of which she is the head.

"Tell me your true wish and I'll make it come true."
"I want to join the broadcasting club."

Hana decides to join the club, and has many "firsts" with the members of the broadcasting club, deepening her love of reciting...

From Sound of Jewels:

At a time when the world was still at peace, to the east of the capital, a beautiful dancer of Noh named Hakubi appeared. She was keeping a terrible secret that she couldn't tell anybody...

Hana meets a good-looking guy at the train station, then happens to meet him again at a blind date. However, despite his indifferent attitude, Hana discovers that he just might be the person she's been talking to online for the past four years!

This is a romantic comedy about a girl who really, really loves the chase and a tsundere boy in glasses.

[OneGarbageGal]

Normal appearance, normal intelligence, normal in arts and sports... just normal. This is the entirely normal 14-year-old, Naru Sekiya. While she admires "Heroines" she continues to live a normal life until one moonlit night she meets a fairy. This foreign girl then guides her into the extraordinary world of the yosakoi dance.

From Transient Mirage:

The lady Yurika has fallen in love at first sight with a 'yankee', Seiki!! Even though it's said that they live in different worlds, what actions did Yurika, who won't give up, take? When Yurika's bodyguard and fiancé barge in, too, the future of her romance is thrown into chaos. But the love between a lady and a 'yankee' is intense, passionate, and a little sensational! Love is a one-on-one match!

This manga anthology includes three stories, recommended and awarded by Hakusensha! The title work and the first story, “Hana Yanagi”, is a heart wrenching love story that takes place in the red light district. The 2nd story, “A Bird of Your Color”, follows Tiana, a young woman with blue hair. Lastly “Dame Maid”, a story of a hopelessly lacking maid and a cute and little, young master.

From Viz: Although Tsukushi Makino is from a poor family, she attends an elite school for the super rich, where her life has become intertwined with the "F4," the ruling boys of the school, in a whirlwind of love and confusion! In 1996 Hana yori Dango received the Shogakukan Manga Award for shōjo. This is the best selling shoujo manga in history. Boys over Flowers officially ended with volume 36, but Yoko Kamio, just couldn't stay away from her beloved characters! Boys Over Flowers: Jewelry Box (Boys Over Flowers: Hana Yori Dango Some call it Volume 37) contains two short stories that take place 1 year after the end of Boys over Flowers volume 36. It also contains a section with some of the important events in the series that show the characters maturing, plus a special bonus strip! .

From Dazzling Scans:

The country of Japan is being terrorized by the undead, known as Revenants. Tachibana Kaguya makes it her life goal to protect her fellow citizens from these zombie-like creatures, just as her father did before her. When she enrols in Reimeikan Academy, a school that specializes in training soldiers that will eventually become part of a movement to expel the Revenants once and for all, she is reunited with Tokugawa Kazui... a boy her father had died to protect—a boy who had promised to build her a world free of monsters.

Enjouji Takumi is a rickshaw driver from the city that has been hired to work in a small town. Meeting the exquisitely beautiful (but rather clueless) Hana is a stroke of luck, and when he ends up working with Hana, Takumi's in heaven. But the "flower of the town" has many admirers...

A story about an oldman and a highschool girl friendship!