1) Two boys stay at the same dorm and seem to be fighting every day... but do they really dislike each other?

2) A boy refuses his kohai's confession saying he only goes out with experienced people. But somehow he still cannot resist...

3) The new in-game at class is chocolate roulette - including chocolate which has the effect of aphrodisiac and whoever draws it, gets to sleep with the popular boy. Same story, Mix Mix Chocolate chapter 1.

4) A very popular student uses his classmate to evade his a clingly girl by telling her "This is the person I like!"

5) At a school festival, a boy is embarrassed because the guy he shares a secret memory with is hosting the show that puts him up for an auction - whoever bids highest gets to spend the day with him.

6) (Shotacon) A tedious rich boy relieves his boredom by playing with his servant.

7) A student was practicing the piano when all the sudden he gets kissed and blindfolded...

From Viz:
Akane is your typical teenage girl...until she swallows the Dragon Jewels, which transport her to the Heian period of ancient Japan! There in the capital city, Akane learns that she has been foreordained to lead the people as the Priestess of the Dragon God!

From HotCakes:

A cute love story between a track runner and an older librarian.

Extra: My Girlfriend Is a Step Ahead of Me

Ryu and his friend Jay find a new companion in Hwa Ja, but find the scrutiny of the outside world harsh and cold. When his family moves away, Jay is left alone.

10 years later, Ryu is notified of Jay's death, and receives one final text message: "Don't ever come back." Despite the warning, Ryu returns for the funeral of his childhood friend, and eventually finds himself back at the house where it all began.

Asahina Yuki, a young man with no special skills save for good luck, was invited to attend Bell Liberty, a legendary high school for elite students. Immediately after arriving, he was given an armband by a mysterious ninja who begged him to protect the school. That armband is the proof of being the Ace of the school - the student council president!

From Starry Heaven:

Amamiya Nonoka is a human that can see spirits. Because of the strange ability she posseses, she has no friends at school at all. Suddenly, one day two handsome brothers appear in front of the lonely Nonoka. Aki and Kou, the two of them came to borrow Nonoka's "strange ability"? Not to mention, they are renting parts of their bodies to continue living...

From Dangerous Pleasure:

Nao and You are cousins. You began to live with Nao’s family after he was abandoned by his own mother. Ever since then, he is always together with Nao and Nao’s childhood friend, Haruki. Haruki enjoys spoiling Nao and even though You is stern with his words, he is always gentle to Nao too. As time goes by, Nao finds himself being attracted to You, and both You and Haruki finds themselves falling more and more in love with Nao. But one day, out of the blue, their love became something that cannot be conveyed?

From Yaoi Is Life:

Ryuuji and Ushio haven't seen each other for fifteen years. It was supposed to be a happy reunion between childhood friends, but because of something that happened long ago, the relationship between the two is strained...?! Taking place in the worn down apartment, “Haitsukoiwa”, four omnibus love stories that make the heart flutter are unfolding.

This is an autobiography that tells the story of Akiko Hayashi, the author as she was in her third year of high school at the beginning of the story. Through her friend Futami, Akiko starts going to an art class led by Kenzou Hidaka, an intimidating teacher who spends much of his time yelling at his students and keeping them focused on drawing with the use of a bamboo sword. Akiko is initially confused by the behavior of the teacher and her fellow students in the class, but she keeps going regardless, eventually becoming the manga author she is today.

Note: Winner of the 8th Manga Taishou in 2015. Won the 19th Japan Media Arts Festival Grand Prize for Manga.

Silpheed is a horse born on a small horse ranch. Even though he is named for a fairie wind he must overcome the handicap of having been born with tendinitis of the leg, and the loss of his mother in his birth. Hayao, the young boy who loves horses, is determined to see Silpheed grow up healthy and become a top racer like his mother once was - with him as the jockey, even when Hayao's dad does not allow him to be so. However, the odds are stacked against the orphaned foal and the young boy. This story is not only about racing - and it is recommended to all manga fans out there

Tsukiyoda Sadame, a hypocrite and a high-schooler who dreams of conquering the world. A person who's popular the moment he transfers into his new school. But suddenly a terrible truth is revealed to him! That there are these awfully ridiculous missions that he has to clear. And if he doesn't manage to clear them... the world will end?! Is this the work of God, or the Devil's deed? Your pride, honour, and appearances - cast it all aside and save the world, Tsukiyoda Sadame!

A boy moves into an old apartment building in order to live on his own but is surprised to find a girl dressed in a maid outfit already there. This is the Zashiki Warashi of the room, whose fiery temper soon rears its head.

From Yen Press:

Life—or undeath?—isn’t easy for Ayumu Aikawa. A seemingly normal high schooler, he is in fact a zombie who serves as a bodyguard to an introverted necromancer. But his already complicated existence becomes even more outlandish when he accidentally steals the powers of a magical girl, transforming into one himself—complete with frilly dress and pink chainsaw!! How’s a reanimated corpse supposed to keep his head on his shoulders with roommates like these girls around the house?

From Attractive Fascinante:

Tsukishiro wanted to know if he's gay. He met his subordinate, Asahina, when he went to a gay pub. Things happened and they finally confessed their love for each other.

Raika is on the track of Surebrec, a drug which spreads in secret all over the world. While she is pursued by mysterious men in black, she meets Nora Kujo, a young boy in eyes minnows...

With simplistic drawing and short dialog, the protagonist and the writer of the story Waroo succeeds in evoking the beauty and the slice of everyday life through gentle humor and sensibility. Even though there is no overreaction, the last lines of the comic that wrap up the event with wit and charm are especially memorable.

From Vices and Devices: Bright and early one Monday morning, Shino Yuzuru asks Seryou Touji out on a lark when they run into each other at the school gate. Seryou, who's immensely popular, has the odd habit of going out with anyone who asks him out first at the beginning of the week, then promptly dumping them at the end of it. "Anyone" apparently includes male upperclassmen like Shino, and as a boyfriend, Seryou is perfect--unfailingly thoughtful and kind. Shino, obviously, has no intention of being in a serious relationship with Seryou. It's not like it's actually love or anything like that. ...Right?

A story about friendship between a little boy Jacky and a cheetah named Ainia.

From Tokyopop:

Zerodaimu Kyupura Pa Azalraku Vairu Rua Darogu (a.k.a. Zero) once stopped the evil demon lord with his incredible psychic ability, and in the process saved the world from destruction and earned the honorable and highly imaginative title 'The Man Who Stopped the Evil Lord.'

Now, he has accepted a position as a teacher at Psychic Academy, a school for gifted psychokinetic youngsters who have demonstrated incredible raw powers and want to learn how to hone their abilities. Among the student body is young Ai Shiomi, Zero's little brother, a somewhat meek boy who, despite parental prodding and his fraternal reputation, feels that his limited skills hardly justify his presence at the prestigious academy.

However, everyone else is convinced that he, like his celebrated brother, is destined for greatness. A lot of pressure for a boy just entering adolescence!