A short story about a girl who is supposed to be a spirit medium, but her lack of self-discipline allows even the spirits of stray cats to take control of her body.

From Night Constellations:

Morishita Haruna is a high schooler who has a crush on a guy, called "Haru" (by his friends), whom she always see at the train she rides on. One day, waking up, Haruna was shocked seeing "Haru" sleeping in her bed! Neither one of them knows why is "Haru" there. After introducing to each other, Haruna knew that "Haru" is actually his surname and his full name is Harukawa Kanata. Kanata was just about to leave but an invisible wall on the door prevents him from getting out of Haruna's room. Him being unable to leave, Haruna has no choice but to go to school while Kanata stayed in her room. At the train station, an old man tried to molest Haruna but Kanata saved her?! But this Kanata doesn't know Haruna!! Rushing back home, she saw the Kanata who slept in her room still there! What happened to Kanata's body?

Oosuki Masato is an ordinary high school boy who is magically transported to an alternative world, but for some reason his doting, over-protective mother comes along as well.

From Fantasyshrine:

Shou works as a photographer’s assistant in a studio. He's approached by Amamiya, the Chairman of an influential production company, to become a model. Annoyed by Amemiya Tsukasa’s arrogance, (yet unable to resist a challenge), Shou accepts Amemiya’s offer. But then Amamiya orders Shou to live in his apartment, so he can personally train Shou to be a top model. But what does the training entail...?

Romance of an elite company president and a Cinderella boy.

With The Master Till Dawn: Rin, Amamiya's bratty cousin, is in love with him. What Rin doesn't know is that someone in his house hold is in love with HIM.

A 17 Year Romance: High school friends discover new feelings for each other after 17 years of friendship.

Anywhere With You: Secluded rich boy with health problems is in love with the delivery boy who sometimes comes around.

The Serious Player: A bisexual playboy always teases his gay virgin ice queen of a coworker.

This manga consists of oneshots that are loosely connected with each other.

Chapters 1 and 3 focus on the new relationship between Shiba, a high-school student, and his teacher Onosaka. Things are not going well -- sensei has an inferiority complex because Shiba likes large-breasted girls.

Chapters 2 and 4 are about Inuo (a friend of Shiba's, who's quite the player with girls) and Natsuda, a boy with whom he finds himself in a love hotel the morning after a wild party. Inuo would just like to forget everything because he's definitely not gay, but Natsuda wants to be his friend so badly that he can't turn him down. Natsuda turns out to be a cheerful and engaging companion, and Inuo starts to spend more and more time with him, going to movies and hanging out. But when he finds himself embracing Natsuda again, he pushes him away -- because he's definitely not gay!

Chapter 5 introduces Shiba's brother Keisuke and his friend Aki. Aki wants to do more than kiss, but Keisuke only went along with the kissing because it was Aki who asked him. So now that summer break has arrived he avoids Aki. But when Aki stops calling and avoids him in turn, he's not happy at all.

Chapter 6 is an unconnected oneshot called Yasashii Kuchibiru (Gentle Lips). Yuki and Kaneda are childhood friends, neighbours, and more, but Yuki never seems to have time for Kaneda.

Chapter Extra: Secrets of a youth Kei and Aki three years later and now in high-school dealing with some "growing pains".

[From Esthétique]:

Kikuchi Ima's first love was her sister's boyfriend, who is 11 years her senior. Nine years later, she meets him again ... and this time, he is her homeroom teacher. What will become of this one-sided love?

In order to become a Strong and Cool girl, the highschool girl Mie Tsukasa joins a professional wrestling organization. Follow her intensive training every day together with her trainer, with the aim of becoming a pro-wrestler.

The Demon King led his army of demons to wipe out the human race. The Hero, Kail, and his allies attacked the Demon King's castle to defeat the Demon King. The Demon King is slain, but at what cost? Kail lost all of his allies throughout the war. Friends, family, lovers, comrades. All dead, and he is dying.
As Kail's life ebbs away in the Demon King's chamber, he notices a strange gem that the Demon King had coveted and approaches this relic to grab it; after an intense light glows, he is sent years into the past. After recovering from the initial shock, now in his younger body, he decides to avoid making the same mistakes of his first time through these years and to become stronger.

A super-powerful guy keeps defeating everyone around him, even though he doesn't like fighting.

A girl who can't be honest. Tsyuki-san and a wondefully honest boy, Imao-kun.
Tsuyuki-san hasn't been rejected...definitely hasn't been rejected......!

At the "Mikazuchi Dormitories" where the male high school students reside, there is a bright and popular Dormitory Captain, Amano and his supportive helper, the Vice Dormitary Captain Hanyuu. Amano always joked and called Hanyuu his "Wife" and even continued to deepen their relationship. But, for Hanyuu, that only continued to hurt him as he held onto his unrequited love for the past 3 years...

From Bliss:

Haruka and Saya spend their days living peacefully with their father in a small town. However, when a new neighbor moves in, unusual events suddenly start taking place. Strangely enough, they all seem to be related to Haruka and Saya's mother who passed away some time ago...

“It’s a disgrace for a man to not eat the meal placed in front of him.” Appearing in front of the biting Shouji is a superb meal!?

Popular host Akusawa Fumi and renowned detective Futagami Takaharu have been classmates throughout high school and college, and also been lovers at some point. They met again two years ago, and have since rekindled their sexual relationship. And while it proved to be as hot and fierce as ever, in truth there might perhaps still be a little more to it than just that..?

From Shoujo Crusade:
Ichino is a high school girl who absolutely hate guys due to the fact that her father betrayed them when she was young; stealing all the valuables that she & her mother possessed & disappearing without a trace. Since then she has vowed to become strong so she would not lose to any man. She has also longed for the day she could meet the lady from a fateful encounter in her childhood.

One day, she accidentally beat up a guy who she mistook as a pervert pestering her friend, Miyabi. She tries to apologize but ends up beating him up even more.... She developed a distaste for the guy and two of his friends as they bump into each other once again resulting in more misunderstandings. Ichino personally believed that if she came across the same person thrice that would be considered 'fate'...

Coincidentally, the start of her school begun with a surprise as she found out that all THREE of them turned out to be her new classmates !!

N/A

Shingo is engaged and his fiance want to meet his parents, but Shingo is reluctant because of a family secret. His mother is in reality his father, he had a sex-change surgery and later married a man, that now is Shingo stepfather. Also Shingo parents own a transvestite bar, his mother being one of the star, the other being all transvestites, one of then having a love interest in Shingo, that is trying to hide that part of his life to his fiance and office coworkers. Shingo also have other secret, he have phimosis, and need to have a circumcision to correct the problem before to marry his fiance. Knowing of this problem one of the transvestites recommend him a doctor that do works for them, and is very discrete. When he goes to the surgeon, the transvestites disguise him as a woman, so he can leave the bar being unnoticed and go to the clinic for the circumcision. The doctor screws it up and thinks Shingo have asked for a sex-change. Seems circumcision is an euphemism for sex-change in the transvestite slag. The surgery is irreversible and Shingo have to start a new life as a woman, working as a OL, and having a lesbian relationship with his fiance.

Yuuta Takenata has dreamed of being a gymnast ever since he was a little kid, so when he gets into high school he starts the Boy's Rhythmic Gymnastics team. Then, the club advisor forces them to take the delinquent Azuma Wataru under their wing. He's loud, whiny and has absolutely no interest in gymnastics. Yuuta just gives up on him, telling to stop coming to the practices. But when Wataru accidentally causes one of the members to break their arm, he has to start training so they can take part in the competition.

Yuuta Takenata has dreamed of being a gymnast ever since he was a little kid, so when he gets into high school he starts up the "Boys Rhythmic Gymnastics" team. He works hard and gets enough members to compete, but then the club adviser forces them to take the delinquent Azuma Wataru into they're club. He's loud, whinny and has absolutely no interest in gymnastics. Yuuta just gives up on him, telling to stop coming to the practices. But when he accidentally causes one of the members to break his arm, Azuma has to start training so as to take his part in the competition.