Once Demons and Humans were at war, and special warriors were needed to defend humans. Now a peace treaty exists between demons and humans. To uphold it human warriors now protect demons from other predatory demons. The Yosogi family is given this thankless task--and it's heir is young Akira, who can't even stand up against his older sister. But only Akira can sense the presence of demons, so he must become the next Demon Defender. But their grandfather has brought in a shy girl named Matsuri--and Akira is warned in a dream he must protect her at all costs!

From MangaHelpers: When an enemy explosion leaves private military soldier Terawaki Ryo nearly dead, a secret organization rebuilds his body using the research they have done in human revivals. Unfortunately for him, the technology only allows him to come back in the form of a teenage girl. His new identity, Shibahara Kyoko, leaves him distraught as his frail body doesn’t allow for the combat skills he used to have or even pick up heavy artillery he used in the combat field. Kyoko is assigned to protect a prestigious academy where daughters of powerful leaders attend since the girls’ presence makes it a hotspot for terrorists to attack and blackmail the people in power. Lead by his former commander and mentor, Major Honjo who has also been reborn as Ryo, was a beautiful teenage girl named Chujo Shizuko, and the pair work together as anti-terrorist teenage school girls. [vyc]

The Van Helsing Church Order is bent on destroying all supernatural creatures, as well as anyone else who gets in their way. However, a certain silver-haired man and red-haired vampire are not waiting for the Church to come to them! During their latest attack on a Van Helsing "cleansing" squad, they inadvertently save the life of a human being..

The protagonist is a descendant of Pcell. This story happens a long time after the events of Blame!. This young silicon creature knows well the havoc that Killy brought and decides to move towards the end of the megastructure, to look for him. NOTE: This oneshot is actually chapter 8 of Blame Gakuen! and So On

A manga about people trying to kill themselves, but weird stuff happens instead

Loser Shinjou Maita is trying to get new members for his movie research society club when he stumbles upon angelic first-year Hotohara Shiori. Life seems to be looking up for him, until a strange woman appears in his apartment, warning him that his life is in danger.

Adventure-student Killy in the Cyber school quest… Features the character of Blame...In a high school setting?!?! Parody. NOTE: These chapters are actually chapters 2, 3, & 4 of Blame Gakuen! and So On

A highschool otaku named Aki Tomoya runs into his dream girl one day...only to find that she has the faintest presence to his chagrin! Now with his otaku passions, Tomoya wants to turn the girl into a heroine in the only realm he is familiar with: 2D dating simulation game. To accomplish this objective, he scouts Eriri Spencer Sawamura, his half-foreigner childhood friend equipped with artistic talent, as the illustrator, and Kasumigaoka Utaha, a famous prodigy writer, as the script writer.

An unemployed bachelor meets an enigmatic vampire. What will happen? Find out in this hilarious webtoon. This webtoon is a Best Challenge on Naver.

From Manga Updates "If you can get 5 million yen for killing a person, what would you do?" A beautiful woman asks Shiki, a part-time lecturer that question on their first meeting. Shiki answers "If it's an evil person...", mistaking this for a joke. But then the woman points out the target...

The story is about a man who can see birds around unfortunate people.

Expatriate Japanese artist Benkei lives in New York. His secret? He may be the only artist in town who isn't entertaining fantasies of being a hitman - he's living them.

It covers the adventures of two teenagers, Karin and Reiji, as they try to run Karin's family restaurant when the only adult around, her mother gets sick and is unable to do the job. Both kids know how to cook but the boy, Reiji, is better and he doesn't let Karin forget it.

Morohoshi Daijirou's take on the Grimm Fairy Tales. Some are relatively straight adaptations while others have a sci-fi, horror, comedy, or mystery-twist.

The premise is simple. You follow the days of Sergeant Maritan, a Drill Instructor of um… the U.S. Marines? Well, yeah. Apparently, Maritan is actually a Princess from the Magical Kingdom of Paris Island, which has signed a treaty of co-operation and friendship with the Great United States of America. God bless America. Maritan usually goes around abusing training raw meat recruit Army-tan, under the supervision of Lieutanent Commander Navy-tan. There’s a GA-tan somewhere near the end too, a meganekko attached from the Self Defence Forces, it seems.

In order to determine which hot spring is to be the top overall, all of the hot springs within the region enter an unofficial tournament. The tournament is simple battle of capturing the enemy's flag, but the battle itself goes beyond any human measure. It is customary for a female to enter these battles. Carrying their pride and their flag, their only objective is to defeat their opponent. Hence they are commonly called "Fighting Spring Princesses." Kikko, the Fighting Spring Princess of the Aizen Hot Spring Temple, is an eccentric, hot-blooded person who is going to have her debut battle. Sit back and enjoy the story of Kikko's path to becoming queen of all hotsprings! [Source: MangaHelpers]

From Ryuusei no Mafia: Minnie’s the only human living on an alien planet and because of that she’s rejected by almost all the other inhabitants. Then one day something falls outside of her house and it happens to be... a human prince?!

Vampires exist. It is the duty of Hellsing, an organization sponsored by the British government, to hide that frightening fact and protect the blissfully unaware populace. Along with its own personal army, Hellsing also has a few secret weapons. Alucard, an incredibly powerful vampire, has been controlled by Hellsing for years. Although he dislikes being a servant to the Hellsing family, he certainly enjoys his job as Hellsing’s vampire exterminator. Seras is a fledgling vampire and a former police woman. Although reluctant to embrace her new self, she is still a valuable member of the organization. Integra Hellsing, the current leader, is usually fully capable of fulfilling her duty, but lately, vampire activity has been on the rise. Unfortunately, the cause is more alarming than anything she could have imagined. A group long thought dead has been plotting in secret since their apparent destruction over 50 years ago. Plotting to plunge England, and perhaps the entire world, into war.

A oneshot that appeared in Comic Flapper 2015-02.

From Garo 1982-07.

From Entropy: This is a set of one-shot stories of working people drawn from the viewpoint of Matsukata Hiroko, who is a 28-year-old single woman and is an editor of Weekly Magazine, JIDAI. She’s often at odds with Tanaka Kunio, a novice editor. Her work already stresses her out and he’s unapologetic about his own mistakes! Everyone refers to Hiroko as a masculine woman for how seriously she takes her work. She smokes too much, works too much, and never has sex. However, when it’s time to get a story done, she switches into “Working Man” mode where her testosterone in her blood increases, she works three times her normal speed, and all thoughts of life’s necessities disappear.

The human race has been infected by a strain of bacteria that was originally isolated in South America but has spread all over the world. The symptoms start with fever and vomit and eventually ends with the person in a coma. However, those who awake from that coma are those with incredible intelligence and they're soon able to see that they are in fact being ruled by higher beings that they thought only existed in fairy tales like demons and witches. Arthur Pyuty was a witch who ruled a kingdom under the guise of a human until the side effects of the bacteria revealed her true nature to humans and they started revolting. In fact, Arthur and her kind, who used to hold high political power in society, are now being hunted down. Arthur and her assistant Ataru, a zombie, must move from place to place in order to avoid humans but also so that they can find a way to make things go back to how it was before.

Updating

Alice waits with her mom in an elevator. All the men look at her mom's breasts. Alice doesn't see the reason in it. Although, for some reason, it doesn't seem right. While pondering the reason why, she realizes she's in another world just like that famous protagonist in that one story. There, strangely enough, she too has the guys' eyes glued to her, for she was an adult woman just like her mother.