This is a spin off story that occurs about three years before Spiral. One of the main characters is Imari, who is in love with the kid who wants to be a detective, and which also quit school running after Kiyotaka, and it seems he's dating a murderer without knowing it...? But how is it all connected to the blade children? Not long after, our favorite blade children from Spiral appear for the rescue, all manipulated by Kiyotaka.

Nanami Rei has always lived his life in his brother's shadow. He can't talk to girls, he's not athletic, and his grades aren't good. On the contrary, his brother Ren is smart and popular, but he has never judged Rei for his faults or lifestyle. One day, Ren goes into shock and mentions to Rei the name, "Wonder Rabbit Girl". Rei, seeking to find this mysterious figure, attends Ren's school, disguised as Ren himself.
Rei comes into possession of his brother's USB drive, which contains a list of the school's girls and their fetishes. Rei believes that one of these girls must be the Wonder Rabbit Girl.

The resonating Echo of the sword changes the boy's fear into rage.

From Jcafe24: Corpse Party: Blood Covered is about a group of high school friends in Kisaragi Academy. Kisaragi Academy was built on the grounds of Tenjin Elementary School, which was demolished after a string of disappearances and gruesome murders. After a mysterious earthquake, the students find themselves trapped in an alternate reality Tenjin Elementary School, where the murders of others trapped before them have continued unabated...

After years in an abusive household, Bell fled from her hopeless situation.

After being left bloody and beaten on the side of the road, she experienced a Christmas miracle.

From MangaHelpers:
This is a story of a group of college-age people who struggle with gender and sexual identity.
Yuki (nicknamed Yoshiki) is a girl, but she is terrible at 'being feminine.' She mostly dresses like a boy and is often mistaken as one. However, she has to wear a skirt and imagine being dominated by a guy in order to masturbate. Nagao Mikako seems young and innocent, and she uses that apparent innocence to sell her body as a fake 15-year-old. She knows her youthfulness can't last forever, but she enjoys tricking the men. Her friends have no idea of her sexual habits and believe her to be sweet and sheltered. Aiba Kaito is a pretty good-looking guy, but he wants to be Nagao Mikako. He often dresses as a girl, picking out clothes that mimic Mikako's style. Though he's into cross-dressing, he is still attracted to women. Will these young adults and their friends be able to handle their 'guilty secrets' and muddle their way through this confusing period of their lives?

When humanity was threatened 5 years ago, the boy who saved the world was driven to despair and became regarded as the enemy of all of mankind. And now a new crisis approaches humanity. The curtain rises on a gallant drama about a hero falsely charged.

A reclusive, disfigured man stalks a pretty, good-natured housewife. One day, he witnesses this woman's daughter being kidnapped.

From Asclepias Scans:

Park Min Gyeom is a human with a disease that makes him produce excess blood. Kim Chun Sam is a half-vampire who needs blood to live. So begins an unusual symbiotic relationship between "predator" and "prey."

Note: This series contains additional (optional) 18+ scenes.

This is a 5-volume manga series comprised of individual short stories that all have to do with coffee one way or other. Each of them is bittersweet with a philosophical bent.

After jumping into the sea during a cruise, Fukamachi Wataru, the famous musician, lands on an Hoshi Island, a place inhabited by folklore people. There he meets Himukai Antsu, a girl gifted in the arts of singing and dancing. With her, he is able to find his calling again, and once more create music. What he wants is to take her to Tokyo so that she can share her gift with the world.

The series is composed of four protagonists.

Nori: An energetic, upbeat girl who was heartbroken sometime ago due to her childhood friend. Now she is headed to meet Haruna, the lonely kid she always played with back then, but to her big surprised grew up into a hunk.

Kyou: The school's prince. From a distinguished family: he is handsome, smart, athletic and rich. He has never struggled for anything in his life, be it money or women. Haruna's sudden return throws him off momentum.

Saeka: She, Nori and Kyou are childhood friends. She is mature, composed and understands the two quite well. Although beautiful, she has been in love with her teacher since middle school and therefore never gone out with anyone. Will her feelings be answered or will she find an unexpected love around the corner!?

Haruna: The boy who comes back after having been away for many years. His reason for returning is unknown. The guy who’s clouded with mystery shows interest in Nori. Does he really like her or is there something else behind it...

Summary: Nori Sakurada is riding her bike one day, when she meets up with a boy she used to know when she was little. He has grown, but doesn't look very happy...

Also contains a side story called Himitsu no
H-kun in vol.1:
The well-known and popular Hakozaki-kun is the dream of every girl in Miwako’s school. However, he's hiding a secret! One day while walking down the street, Miwako notices him secretly taking photos of elementary schoolers!! Could it be that the famous Hakozaki-kun is actually… a… a pervert?!

As working woman and plant fanatic Sayaka Kōno was heading home from a drinking party, she found a handsome man sitting in front of her apartment who says, "Please bring me home with you," like a dog. With no place for the unnamed man to go, the two begin living together, and their "delicious" love story begins.

Yuu Tomonoga is a genius who was accepted to an American university at the young age of 13 and later accepted into the university's graduate program. Unfortunately, he loses funding for his research, but decides to drop out and continue the research on his own. He travels back to Japan in hopes of getting funding, but he quickly runs out of money for daily living. Luckily, he gets a call from an old friend and accepts his offer to teach at an all-girls school.

The story is set in a dystopian near future where the Japan society is experiencing a crime rampage and in which a powerful and secret religious organization, with mysterious goals, is acting as an invisible hand behind the scenes.

The main character is their strongest assassin, lent to them by his fanatic mother when he was a child, and now a ruthless killing machine whose fists and feet cause serious damage to his adversaries, and whose weapon of choice is a special cutting wire with which he grabs and scorches his opponents.

He's a man hunter, whose childhood has been stolen and molded after his tormentors, but when the road of forgiveness is precluded to him what can be left to a man to obtain the redemption?

Takeo finds the answer in the vengeance, and in eradicating that same evil from which he has born.

So this dark and impressive badass guy, after betraying the sect, gets down to business kicking their ass and unleashing his fury against the deadly opponents sent to stop his unparalleled revenge.

"The youth ensemble of love, food and war..."

What would you do if you could stop time? Moritani for one is using her unusual ability to stop time for three minutes a day to observe the people around her. One day, she chooses to "observe" class idol Murakami's panties - only to find herself in a very compromising situation when her classmate turns out to be immune to her power.

In a country where women rule supreme lives a poor but happy boy named Albert. An excursion to the city turns dangerous when he and his friend are abducted by slave traders, and later purchased by a noblewoman's servant. If this wasn't crazy enough, it turns out Albert looks exactly like the noblewoman who purchased him. But she's no ordinary aristocrat. She's a princess! And he's to act as her double from today on!?

From Go! Comi:

Like most teenagers, Mashiro Ichijo has a secret. But Mashiro's secret is that he’s neither fully male nor female! So far, Mashiro's been able to live his life as a boy, but all this changes when he's informed of a new class he must take in order to graduate from his elite prep school. To pass, he must find the “Key”…and the only way to find it is to enter into a nightmare world where his body and soul are put at the mercy of the worst kind of enemies: his classmates!

SERIES 5: Vento Aureo
Set in 2001 Italy, the story follows Giorno Giovanna, son of DIO, and his dream to rise within the Neapolitan mafia and defeat the boss of Passione, the most powerful and influential gang, in order to become a "Gang-Star" and make the world a better place. With the aid of a capo and his men, as well as his own resolve, Giorno sets out to fulfill his goal of absolving the mafia of its corruption.