A prequel to Chaos;Child that details the life of Kunosato Mio before she got caught up in the events of the Return of the New Generation Madness. It starts from her childhood, and eventually leads to the point that she comes under Makise Kurisu's tutelage.

From Del Rey:

Lucia is the new girl at school. She and her sister run a public bath that's all the rage. When Lucia meets a terrific-looking surfer boy, there's just one little problem: Lucia is a mermaid-not just any mermaid, but a princess on an important mission to save the seven seas from an evil force bent on taking control of the marine world. Such a responsibility doesn't leave much time for romance. But Lucia vows to protect her world and win the heart of handsome Kaito.

Tankoubon #7 includes 3 short stories

Get Nude
Moonlight Goddess Diana
Cherry Blossom

An ordinary high school student, Satou Ichirou, was born to a demon father and a human mother. Together with his best friend (← one-sided), the beautiful grim reaper Freddie, and the money-obsessed Rinto, who looks almost like a rabbit, he is enjoying his high school life in the demon world today!

A romantic comedy with a distinctly Japanese flavor. Next-door neighbors Chiro and Ritsu have been best friends since childhood. Ritsu, the son of a family of traditional nichibu dancers, is thrust into the public eye as his career takes off, and his growing fame begins to test the pair’s friendship. And now the twist: when a wish made at a shrine actually comes true, Chiro and Ritsu find themselves inhabiting each others’ bodies. A further complication arises because Ritsu is not just a dancer, he is a famous onnagata, or female impersonator, popularly known as the “Courtesan Prince.”

A Lovey dovey daily life with ara~ ara~ wife who can do time leap

Tokina is a self-proclaimed Timeleeper who loves to pamper her husband, Nobumichi. But today, there's something wrong with Nobumichi! While her husband accepts her sweet behavior without embarrassment, Tokina's flirting gradually escalates...?

Yu XiaoBei, a worker, in order to pay for his sister’s surgery, he chose to enter the mysterious arena and learned that if he survived till the end he will be able to control the world’s economies. Unexpectedly, Yu XiaoBei would face his treacherous competitors, caged in with a monster, and participate in a thrilling death game. To his delight, an unexpected gift made the protagonist determine that there was a chance to achieve his goal!

In a world that always has 16 heros, Sion [Shion] is a hero of darkness and the strongest. But he has been tricked by his own companies. Being sucked power, He was teleported to a far place…

After the great war of the late 1990s as Japan begins construction on a new capital city, earthquakes cause massive destruction and rumors of demons have begun to emerge. The protagonist receives a warning and a demon summoning program.

A trendy girl and aspiring idol thought she'd get a pet octopus to make it big as a pet idol, but she ended up getting Cthulhu! With the help of an elder god, aim for the top!

Amy is an ordinary girl who lives with her beloved father. However, she is not human, but a doll made up of cloth and cotton. Why was she created, and what does her future hold?

Houdzuki Maika is a high-school girl who, in a sense, is never alone. Her twin brother Maito, who could not survive birth, lives inside of her and shares her body. They switch between who gets to live each day and they share most of their memories. However, the only times they get to see and talk to each other is when they are both asleep, where they share the same dream. Perhaps as a result of this supernatural existence, they are able to see ghosts. There will surely be many mysterious incidents ahead for these twins to face!

When a guy woke up, there was an unknown woman with long hair... It sounds like a horror movie? But what if he had a thing for it?

There was a girl who could read people's "minds". Her name is Emma Wallers. She is a trainee of the American unofficial intelligence unit "CAT" who is trying to find her mother's killer the "Lollipop Man". A cutie girl with outstanding fighting ability! Falling into a pit!! Revenge story of entertainment power Mashimashi ON FIRE!!!

The story follows Haruo, who one day loses his wife, Hinata, in a car accident. Heart-broken, he one day returns to the manor where his wife lived in order to take care of it. However, this will not be easy, as the manager, Hinata's younger sister, blames him for killing Hinata.

The story takes the place in the world where using the magical powers is natural. Hiasen, the son of Ran, is raised by the powerful wizard, Kasin, who is also a friend of Ran. The story begins with the time when Hiasen asked Kasin to send him to the school for a gift of Melly Day (February 29th, comes in every 4 years).

From Twilight Scans:
The story of Kim JaeHan starts now! A dad who only has eyes for his daughter faces a sudden death. His mission is now to protect his daughter DaHyun from the 12 bullies by using his powerful character from webtoon drawing when he was once alive! As a dad, he'll never let his daughter get bullied. If he sees this?... he won't let those bullies alone. Whoever touches my daughter, you're fucked.

"This manga is about the job of cleaning up scenes of death, and discusses the meaning of life and death. Through interactions between the deceased's family and friends with the death sweepers, we understand the meaning of death. No matter is it is a peaceful death at the ends of one's life, murder, suicide, death from illnesses, when death comes, who would be able to predict it, or prevent it? That is why we have to try our best to live on."

One day, a giant monster in the shape of a bug appeared over the world… with only the "Children of the Butterfly" to fight against it.

Revenge~Sure is a sweet thing!