The protagonist, Ayanagi Towako is a student council president famous as a man-hater. From her encounter with Yui, "a certain secret" gets exposed...?

It's the start of a new series fully packed with immoral situations!

There are many similarities in the makeup and appearance of the main cast to the cast of Doraemon, which was also created by Fujio, though the content of the story is completely different.

The main character is a scientific genius boy named Kiteretsu, who has built a companion robot named Korosuke. He frequently travels in time with his friends and Korosuke in the time machine he built. Miyoko is a girl in his neighborhood who is basically his girlfriend. Tongari is his rival, who happen to share some similar traits of Honekawa Suneo. Buta Gorilla (Kumada Kaoru) is a typical neighborhood bully, who also share similar traits of Gian (Takeshi Goda) except that he often antagonizes Korosuke. (though they are in grade school).

Twin sisters yuri.

From Evil Flowers:

Ji-Eun has been dating Gyuho for 3 years now and he's pretty much the perfect boyfriend. Even the way they meet was perfect, the same as in her favorite movie, Twilight.

But now she learns that he is a Kumiho (Nine Tailed Fox), he's 700 years old and he wants to marry her. And on top of all these weird things he mentions that he loves her liver. Is the price of a perfect boyfriend worth her liver?

Join in this funny contemporary fantasy where a girl learns that prince charming also has a dark side and that stories sound good in a book, but living them might end up not so enjoyable.

With a broken heart, Hwayoung falls headfirst into the river by accident but wakes up as infamous villainess Satiana Altisee Kaylon. Coming to terms with her new life as sole daughter of House Kaylon, Satiana is soon chosen as a candidate for the next empress! In the palace full of schemers and liars, she must become a cold-blooded villainess to win her royal seat by the crown prince - or her new family will face grave danger! Will being perfectly evil really be enough? ‘Cause even villains need love!

Despite being very pretty, 15-year-old Mirai-chan doesn't have any friends due to her pessimistic personality. Tooru-kun is very handsome, elegant, and bright but he doesn't even have a friend, but is it because of his social status? They both want friendship but since it is the first time for them, will it be the beginning of the most immature love in the world?

From Go Manga:

A youthful romance for those who think they are unhappy.

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.

Extremely wholesome onee x shota comedy manga by Shirano Akihiro.

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?

The story revolves around Objects - powerful, massive weapons that change the course of warfare - and Elite Object pilots. An odd Elite girl named Milinda meets Quenser, a student who aims to become a Object mechanic, with the soldier-in-training Heivia on a snowy battlefield.

Raimon Middle School 's soccer club captain, Endou Mamoru is in a pinch - his club is about to be destroyed! Literally! To avert the wrecking ball and disbanding of the club, his team must win against the toughest soccer team in the area - Teikoku. Will Endou and his team meet a crushing defeat or will a mysterious transfer student with a fiery kick save them from disaster?!

Won the 34th Annual Kodansha Manga Award for Best Children's Manga.

"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.

"I'm sure we'll get the target we're after."
Shotaro, a ruthless killer, code name "S".
But one day, the target is the leader of the "Waruiyogumi" gang's only daughter - Furukawa, 17 years old.
The moment he points the muzzle at her, he feels something he never felt before! Shotaro feels his heart grow...

A genius killer, now a young girl's bodyguard?
The heartful killer comedy begins.

Tougo Ushiwaka reunites with his childhood friend and first love Ren Ryuugasaki after about 10 years. However, Ushiwaka had been traumatized to discover that Ryuugasaki, who he had thought was a girl, is actually a guy with a fondness for cross-dressing.