From MangaHelpers:
One day, 22-year-old Kanzaki Misuzu is suddenly transported to a strange world. Based on the pop-up screens she can access, it seems she's entered some kind of RPG as a magic user! Luckily, she can use the gaming skills she acquired as an otaku to make her way in this new world. But before she knows it, people start calling her "the Black Healer".

A special 100-page bonus volume bundled with the limited editions of the anime Blu-ray/DVD volume 1 set.
It contains two side story chapters about Bulat and Sheele, and the opening pages contains a crossover with Isshuukan Friends.
Rereleased in a standalone volume with 2 new chapters in December 2017.

The vampire princess Alice goes to the human world to find a groom in order to inherit the throne, and finds an unlucky man with a very powerful aura.

From INP-Mangaz:
Minori's motto in life has always been to smile no matter the hardship. However, her sweet personality in attempt to make friends has led to constant bullying and being taken advantage of. Pushed to her breaking point Minori begins to give in to peer pressure until she is saved by a beautiful girl named Alice.

People called “challengers” are gambling their life trying to escape from The 100 Story Tower to win 10 billion yen. But what will happen when Tatsuki Kuroumi awakes at this tower without remembering anything about his prior life, including entering the tower as challenger?

The demon sword that destroyed the WuLin world has appeared once again, those who are possessed by it become "Blade Ghouls". Pei Lie is a simple bladesmith in LiuYing City, by chance he is dragged into this sinister plot that has been planned for years. Will he win in his fight against the dark forces?

He kills people like flies, a schemer and an executioner. He is also a blade, a chesspiece, an offering to the shrine of power. Everything ends in the Snow Plains, everything will also begins there.

From Kirei Cake:

It's been declared that Nishi High will close in two years. Since then, the student population has dropped to a mere seven. Hazakura Motoya, one of the remaining students, decides to stay for the free ride through high school.

Suddenly, everyone is shocked when they receive three new transfer students, Kayama, Mizumura, and Toujou, girls who are actually members of a special military division.

Soon after, Motoya and the three girls witness a giant tower suddenly appearing on the school grounds. Motoya is destined to enter with the girls in order to uncover the mysteries of this tower.

A parkour boy becoming a hero in the hacker's world!

1. Moon Walker LTD. ~Albatross no Shuujin~
Gaia, a mysterious man with the talent to escape from most bonds is sent to a top security prision, only to meet a police investigator investigating this corrupt prison and then trying to escape...

2. Moon Walker LTD. ~Garimpeiro to Hikaru Ishi~

3. Moon Walker LTD. ~Tenkuu no Chiisana Yuusha~

In an alchemical ritual gone wrong, Edward Elric lost his arm and his leg, and his brother Alphonse became nothing but a soul in a suit of armor. Equipped with mechanical "auto-mail" limbs, Edward becomes a state alchemist, seeking the one thing that can restore his brother and himself... the legendary Philosopher's Stone

Note: Won the 49th Shogakukan Manga Award for the shounen category in 2004, the UK's Eagle Award for favorite manga in 2010 and 2011 and the Seiun Award for best science fiction comic in 2011.

In this day and age there are numerous online games you can immerse yourself in, and "Under City" is one of them. Despite the fact that this is a survival game which requires strong guts to survive, with gory scenes and corpses all over the place and hungry players after each other's blood, the "Hallow Man", an indiscriminate killer who slaughters anything and everything he comes across in the virtual world, soon begins to terrify even hardcore fans. Under City is "under siege" now, and the players are wondering...can anyone stop this deranged murderer who is ruining their free time with his bloodthirsty antics?

Starting today, I retire. But what should I do...... I don't have any talents, and I don't have the brains for business. My only talent is to defeat enemies all over the world. What a pain......

Since the last eruption of Mount Fuji, the nights of Japan, and this city, have completely changed… Some of the humans who were covered in volcanic ash became like vampires with incredible powers, and then began an era of killing and blood washing blood! Among those who have reached the height and dictate the rules of the World, Domino, the young woman who came to ruins, climbs her way to the top! The sinister and terrifying battle now begins!!!

The Sengoku Era… A time when losing a battle meant losing it all. The Sword Saint, Isshin Ashina, aims for world domination… That is, until he encounters a certain Samurai…

Touzuka High School is a public school with a very low grade point average. One day, a girl, who had been expelled from the state's top school, St. Katria Girls' School, transfers in...Her name is Kawaii Maria. The official reason of her expulsion was due to "violence against the teacher." Because of straightforward comments, Maria starts to become isolated from her class...What is hidden in her past and what will happen to her? From Baka-Updates: Wiki Akuma to Love Song revolves around an unusual girl, Kawai Maria who was expelled from her previous school, St.Katria Girls' School, and soon transfers to Touzuka High School, a public school with low standards. Her sharp tongue and straightforward personality often leads everyone else to hate her with the exception of two handsome boys who eventually get involved with her. With a devil's aura like hers and an arrogant facade to pair it up with, it's just too hard to be understood. And so Maria needs to deal with bullying, adjusting, fitting in and romance. Just how will a devil like her cope with all these predicaments?

However, these mid-bosses kept getting defeated by the heroes, who continued to grow stronger with time. Which led to the demon king’s army needing to produce even stronger mid-bosses.
It was at that time that a certain demon stepped up.
Demonstrating great wit, she became the demon world’s founder of the official mid-boss training academy!