High school girl, Hina, has a routine to shift everything that is of importance to her to an “empty house”. However, one day, she gets spook by a boy who started living there without her knowledge...?!

From Go Manga:

A youthful romance for those who think they are unhappy.

A bachelor for the past 11 years, Higuchi Yuuki is a male teacher in an all-girls school. He keeps wondering how to bridge the gap between himself and his students when he’s suddenly confessed to by Ichikawa, one of his students!

Although Higuchi rejects her, Ichikawa does all she can to get her teacher to turn her way -- even if it means making him grope her and holding his hand in class! When Higuchi can’t understand why she’d like an unimpressive and inexperienced guy like him, she kisses him! Will Higuchi be able to handle the feelings of his beautiful student, especially when she’s not the only one to have fallen for him…!? A dramatic school love story unfolds!

The "240" in the series' title is pronounced "Nishio" as a reference to the writer's name. The manga celebrates the 15th anniversary of Nisio Isin's writing career, and it includes characters from Nisio Isin's works.

Has anyone ever made fun of your dream?
Magic is something everyone in this world desires. Dawn Hill, with absolutely no experience in magic, has been accepted to the best magic school in Wuzhou. The only problem is she's the "worst student" they've ever seen. Faced with ridicule, rejection, and contempt, can the stubborn little witch fight back?

From Intercross:

Origawa Industry Public High School is a school filled with rough men. There's only one girl in this high school packed with wolves. But this little sheep isn't an ordinary person!

Also includes the following short story:
Konna watashi ja nashi desu ka?!

Yanagi's dad is a president of a large hotel, he himself is handsome and clever, always wins the favor among girls. Moreover, he's always on the top of class and champions in all sports meetings when he was in primary school. But after he met Kujou, a transfered student, he had never savored the taste of victory in any single match with this girl for ten years. "Let's bid for final victory, Kujou." There here comes the last game. Will Yanagi fall in love with Kujou while he hates his competitor but cares so much about this girl?

A love comedy between a fujoshi and a fudanshi!! Natsume Makoto, a college student, started dating a person while hiding her love for yaoi. She eventually mustered the courage to come out of the closest, but it turned out her boyfriend, Sudou Kojirou, also loves yaoi. Moreover, he's the complete opposite of Makoto...

Their relationship is still developing, but their lives as otaku does not slow down. Also around them, unique "yaoi otaku" friends are gathering together...!?

"One boy upset over his soft, cute appearance. The other boy, because of that boy's pretty and cute appearance, deliberately provokes and fans his anger to reveal his own Masochistic traits. What will happen between them?"

Athena, goddess of wisdom, goes back to school to seek revenge!

Doumori Hiroto is a mysterious boy from a lineage of ancient spiritualist who have been guarding the pathway to the underworld for a thousand years.

But he was born with a defect caused by bloodline of magicians mixed into his ancestry.
He possessed both spirit and magic power instead of either, yet he was able to use neither.

For this reason, his grandpa took him to his friend, a chinese sage, to have Hiroto being taught the sage cultivation.
He quickly mastered the sage path and was said equal to a hundred years cultivator.
Somehow, thanks to his sage power he became able to wield his original spirit and magic power.
However, during an incident where he had to unleash his full power, the recoil of that power caused his existence to be erased from everyone's memory.

Kouno Akira, class president and otome game lover, has decided to never get involved in 3D love. One day she bumps into Sakurasaka Pure who tells her straight that she would be Akira's future "Amore". Not only that, Pure even transfers to her class, follows her around until Akira runs off, telling her she does not intent to get involved in 3D love. Pure doesn't give up and tries to fulfill the wish of the 24-years-old Akira, who told her to look after Akira's high-schooler self.

"More-than-friends but less-than-lovers", that type of sweet-and-sour youthful story starts here.

The manga follows the everyday lives of five siblings—four sisters and one brother—who share a multi-unit apartment (danchi).

From Shinnen:
It's the start of their senior year, and Shiika happens to be in the same class as a guy named Megumi. It's a mystery to her why his voice echoes through her mind.

In the year 2045, VR-Capable brain implanted communication terminals have become widespread. With the advent of this world changing technology, the world has become an almost unrecognizable place. From e-sex indistinguishable from the real thing to advanced artificial intelligence, it seems anything has become possible. Except for, of course, the redemption of my pathetic love life.

In a seaside city, Fuuko, a young girl who likes places where she can feel the pleasant wind, joins her high school's sailboat club. Despite being a complete newbie, will she be able to compete in the tournament...? A marine sports 4koma drawn from the author's experience!

I applied here since it's a close walk from my house. But it's really full of girls, huh? In this 4-koma series Tsuda Takatoshi is a new student in the recently gender-integrated high school. He's asked to join the student council as the vice president. Thus begins his days as the only normal boy among 3 female student council officers...

Like an RPG character, Dannoura Choushi possesses a constitution that allows him to respawn at the last place he slept whenever he dies. When he saves Yamazaki An's life, she falls madly in love with him. Will he able to respond to her heavy love? The curtain opens on a sinister, yandere comedy.

Even though she likes Goto-kun, she's too embarrassed to be honest.