When the national idol Kusakabe Yuka suddenly retired from the entertainment business, it shocked the world and it devastated teenager Hata Kosaku. Kosaku was Yuka's biggest fan and her departure left him depressed. His classmates at the Tamo Agriculture School finally are able to get him to leave his room and attend his class, but to everyone's amazement, Kusakabe Yuka (her stage name) comes into the class under the name Kinoshita Ringo as a transfer student. Kosaku realizes he has the once in a lifetime opportunity to get to personally know his dream girl and, together with his group of friends, try to find out why she is here and become closer than just classmates.

From Easy Going Scans

A man who isolated himself from the world for thousand years in the hope that he will become a human. A mountain spirit who deceived him for his own good. Now that they meet again after thousand years, the spirit finally tells him the real way to become human. While the man continues his struggle for becoming a human, the spirit tells him stories...

A high school boy named Kōichi Madanbashi who has Hi-ERo particles, the power source to operate the robotic weapon Daimidaler. With the help of Kyōko Sonan from the mysterious Prince Beauty Parlor organization, he stands up against the Penguin Empire that troubles humanity.

"Love Flower"
A three-part story featuring a loving adult couple who find a high school girl devastated by her senpai's apparent rejection of her feelings. The two women encourage her, and happily watch as a romance very reminiscent of their own teenage years begins to develop.

"Romance Women's Detective File"
A two-part story about a detective who helps locate her one-sided love's ex-girlfriend.

"Milky Way of the Two"

"Mystery of the President"

The year is 1949. Japan had been defeated in World War II and was occupied by Allied Forces consisting of American, Australian, British, Indian and New Zealander troops.

A young woman meets a young man. Both have lost everything because of the war. Tome Kano, a barmaid, and Katsuya Ranzaki, a wealthy investor. The two are fed up with their lives and want to live "real lives" for once. Katsuya's starting up an all-girls baseball team with Tome on it allows them to do this. In this dramatic story, the dreams of a nation come alive. Through the determination and strength of Katsuya and Tome, girls baseball becomes a sensation, and Tome a superstar.

From Yuri Project:

Youko has a complex from being compared to her older sister her entire life, so middle school is off to a bad start when the tennis club is trying to recruit "Aiko-senpai's younger sister" and her best friend Maki. She is shocked to find out that Maki is interested in both the club and its leader Keita, whom Youko immediately disliked, and unfamiliar feelings of jealousy soon threaten to cause a rift between them.

Story 1: Himikoi (also included in Rabu Kare - Gokujou Men Dokuhon!)
What if the secret she could never tell was revealed, just before her high school graduation? To be able to face her feelings for Yoshii, whom she has a crush on, the two of them begin a secret game in their secret place. With the last day of school impending, what will be the outcome to her love...?

Story 2: During a Stormy Night
After losing her cellphone, Nao is only hoping that someone nice enough would pick it up, but much to her surprise, the person who finds it is the guy from the video store near her house. Too shy to go and reveal herself, she starts communicating with him solely over the phone.

Story 3: The Glass-bead Bridge
According to the old legend, if you dig out a glass-bead from the famous glass-bead bridge, your love wish will come true. That's exactly what Niina is trying to do during the cold winter time. Every night going to the glass-bead bridge and slowly digging, she eventually gets spotted by her old middle school classmate. Not promising to even meet up once, they still keep seeing each other every night by the glass-bead bridge. Will Niina's wish come true?

Story 4: The Red Turtle's Dream
"I like Sensei." Riku is loving him one-sidedly, but Sensei, who is very self-centered, doesn't even try to accept others. It is only during the short time while she's looking after his pet turtle, Kamekichi, that she feels closer to him, but Sensei's emptiness can't be filled with anything. She wishes for him to find happiness, even though she knows she can never be the one to fulfil it.

Story 5: A Perfect Day for a Picnic
A broken family can only find comfort in a family that went through the same problems. Years pass and people grow old. Some grow into wiser adults, some into young adults, and some into teenagers; teenagers that become interested in love and feelings. Their nervousness and awkwardness can lead to an uncomfortable situation, one that may make them regret what they did. Are love and feelings stronger than family bonds?

Story 6: The Hideout of Those Two
Thanks to her constant bluffing, Chi always spends her days on her own. Her only solace is the secret hideout from her childhood where a kind and protective Nii-chan used to live leaving her with a key and a promise. Will he really come back and when he does, what will change for Chi?

From Yen Press:

High King Madeth and his dear friend, the knight Lalvan…

By all appearances, the ties that bind the two men are made of the sternest stuff, but in truth their friendship has always struck a most delicate balance. With the arrival of Lady Prima and then her newborn son, Perseus, the precarious harmony between Madeth and Lalvan crumbles. And years later, when the young Perseus, harboring questions about his birth, seeks out Lalvan, will the repercussions be much greater than a friendship lost?

A lone angel, its eyes replete with sadness, watches the tragedy unfold…

He died, only for a minute. Minakawa Ryo was an ordinary high-school student until the day a girl jumped off a building, killing him with her. He miraculously comes back to life but with a new ability to see and hear what ordinary people cannot. Then one day a mysterious girl, Hokuto Shou, appears and tells him that his half has become a resident of the world of the dead. His previous ordinary life has dissipated, and a new life between the "living" and the "dead" begins.

Included is a special arc called A King and a Baron+.

"I can probably no longer return from being drawn to such a world."

The history is about a half japanese, half italian man in New York, who works as a contract killer for the mafia

Nobody know where it is, but it's a place that offers shelter to those who hate their lives or are trapped in the labyrinth of their own hearts... a mysterious hotel. Even now, those who are tired of their lives come to stay in the "Kiri no Mori" Hotel...

In 2012, the author released another chapter, not yet included on a volume, as part of the 35th anniversary of Petit Comic.

In her Ay (Aniversary Box - 2013) the author wrote that this work is unfinished.

"While I went to a certain course, the summer of my third year, by chance I saw the baseball field. And while watching you try to hit the ball, you caught my heart." "One year later, I've found you again..."

Hoshino is a timid grade school teacher. Sudou was one year his senior in high school. They meet again for the first time in over a decade and discover that Sudou's son is Hoshino's student. The two of them try to figure out how they feel about each other, and try to remember what it was that had brought them together and ultimately drove them apart in high school. They're both different, but that may not matter as much as how they still feel about each other.

From MangaHelpers:
Himeji Wakaba is a 5th-year elementary school student, and she has the ability to see things that others can't. They are mostly frightening evil spirits, and they tend to do bad things to people who are close to her. As a result, Wakaba has no friends and rarely smiles. On a couple of occasions, she brings home stray animals, but her parents won't let her keep them. However, they're worried about their sad, creepy daughter, so one day they decide that whatever Wakaba brings home next, they'll let her keep.
The next thing she brings home is a pink monster called "Pupipo," but her parents stand by their decision and let her keep it. No one is quite sure what Pupipo is, but it protects Wakaba from the other things she sees. Pupipo also helps Wakaba make friends with an occult-obsessed transfer student and solve problems with bullying. Wakaba's life is a much better place with her pet pink monster!

1-2) Oboreru Hitomi
Aki is a male escort. He takes on customers from the shop. Miyaji-san is an ordinary salaryman who becomes Aki's client. He told him he thinks he might be gay because seems to be attracted to men lately. Aki suggests that they first start with a kiss, but ends up sleeping with him. He likes Miyaji, so he gives him his number. Then they meet outside the store...
Note: Chapters 2 and 3 were edited into one chapter in the tankoubon.

3) Saitei Kareshi
Tells the story of Aoi and his client Kaneko, an ordinary businessman.

4-6) Hearts
Tells the story of Shou and their manager Hayama.

7) Telephone
A sequel of all three couples.

Based on the Idolmaster Dearly Stars DS game.

Ryou has always had a problem with his feminine appearance. As a child he was often mistaken as a girl, and to his disappointment, that didn't change even after he got to high school. One day he came up with his best idea yet for gaining masculinity; he decided to become a male idol!

His cousin Ritsuko worked in the idol industry, so she was able to get him an audition. Unfortunately for his master plan, the company decided that he would make a wonderful female idol. Now, to even have a chance at becoming a male idol, he must first become successful as a girl!

From Chibi Manga:

She loved a teacher. But that kind of love is forbidden! Still she kept love him, and didn't care about it.

One day, she met a boy in white clothes in the greenhouse of the school. She saw his kind eyes and she smelled the odor of wood coming from him. For the first time, Tsugumi felt her heart beating for someone.

But after that encounter she understood that this guy was her teacher...!!

Collection of short stories about married couples.

From Blue Flor:
House 1・ Somei Family
Despite being friends since childhood, there are many things that the husband does not understand about his wife.

House 2・ Kojima Family
A prince in a swimsuit creates a whirlwind romance, and happiness and various insecurities ensue.

House 3・ Takahashi Family
An orphaned exam student is flabbergasted at his older sister's pregnancy and even more so when he learns who the father is.

House 4・ Yano Family
A young widower reminices about his small wife, their relationship and married life.

House 5・ Shimaoka Family

House 6・ Fuyuki Family

Signs of Early Spring

From DrCoke at MangaHelpers:

Even after one month of transferring to a new school, Natsuki keeps her distance from her classmates. Her childhood friend Haruka always tries to push her to be more sociable, but Natsuki just pushes her away. One day, while Natsuki was skipping class and eating lunch on the school balcony, a slime-like substance drops right on top of her. The slime slowly forms itself into... a human girl? An odd relationship between Natsuki and her new alien(?) sister Aoi begins.