The protagonist is sucked in to a weird whirlpool in a river and somehow ends up in a island in another world with native elves that wear leaf clothes, have the knowledge of an new born, and have sex like rabbits. That also have a body as weak as butter.
He decides to become the king of the place and rule with an iron fist and teach the naive elves cruelty, evil and watch as they kill each other.

From Infinity Studios:

When you're the most notorious delinquent at school you have one hell of an image to maintain. The last thing you need is to be seen taking orders from an innocent puppy-eyed girl. But unfortunately for Keiji Sendai, he finds himself in this exact predicament when, Setsuna Yatsusaki, the shyest girl in school (as well as being the biggest klutz) finds out about Keiji's deepest and darkest secret... that he's a hardcore otaku! With her new trump card, Setsuna blackmails Keiji into becoming her slave. But just how long can a weak naive young girl keep such a dangerous young man as her pet dog? Join in on Setsuna's secret as she sets out to "train" a notorious thug in this unorthodox love story.

Note: Was originally serialized in Dengeki Teioh magazine in 2005 as "Kyouhaku Dog’s". This run ended after the magazine became defunct in 2006.
Serialization restarted in 2010 issue of Dengeki G's Festival! Comic under the title "Kyouhaku Dog’s - Another Secret".

Blood, war, and betrayal: this is the story of the Scarlet Macaw, leader of an organization devoted to crushing political threats on the Mervellian continent, a part of the Crimson World.However, the Crimson World is becoming darker than ever...http://tapastic.com/episode/81638

From Enterbrain:
The tale of William Tell has never been rendered this beautifully as in Mitsuhisa Kuji's stunning debut work Wolfsmund, where a fortified barrier-station torments the Swiss Alliance murdering all who stand against it, until William and his son attempt to defy it.
A fascinating reimagining of a European legend, Wolfsmund is a retelling of the William Tell legend with a focus on an actual landmark in the Uri district of Switzerland, the Devil's Bridge at St. Gotthard Pass. Filled with action, politics and drama it has all the makings of The Game of Thrones, including its share of bloodbaths, but told through a historical fiction perspective.

N/A

Sound Horizon and Katsura Yukimaru are back together, this time with an adaptation of the band's 6th Story CD Moira!

Heroes of the distant world of myths.
Who is the one guiding them?
The world woven by the thread of fate..

Original Webtoon

After five years since his last book, “Danny Boy”, Toranosuke Shimada presents an everyday drama about a man going through his daughter's divorce.
Nothing feels vastly different, as he continues on with his daily routine. However, in his heart, the landscape reflected in his eyes begins to change it's colors just a bit.

First year high-school student, Toujo Basara, is now living with two beautiful step-sisters thanks to his eccentric dad. But Mio is actually the new Demon Lord and Maria's her succubus chaimberlain. Throw in a "reversed contract," rival demon tribes, and the ecchi situations mainly brought on by Maria for good measure, and you have a situation where Basara's life will never be the same. This seinen adaptation of the light novel mostly focuses on the said latter ecchi situations that occurs between the three main characters.

When Masami's father died, he was told by his grandfather that he had to move out. In order to find a new place that he could live in for 80,000 yen a month, he asked his unrequieted love "Kagome" to look for a new place for him. But unfortunately, because of that, he has had to join the "extremely normal phenomena observation society" that she founded. And on top if it, there are rumors that things seem to "appear" at the things that the she finds.

A six chapter mini-series by Miura Kentarou set 100 million years in the future, it's about an epic war between the forces led by Zeus and the nether forces led by the giant Alcyoneus.

Anthology of oneshots about the Hanshin Tigers, from various authors.

Adapted from the "How I stalked some dude with an exposed nipple and stumbled upon the Zenithian Swordwwww" thread started by an anonymous poster with the ID YDmPhSO2 on 2ch.

Caution: Read this after playing Dragon Quest V for the full experience!

Invisible but cute? Sweet life with a ghost girlfriend! Rumours are flying around college that Yasuhisa Nobo has a new girlfriend… but no one has ever seen her?! The heart-warming tale of the (for some reason?!) popular Nobo and his invisible ghostly girlfriend!!

From MangaHelpers:

Meldina hates humans, and wants nothing to do with them. Since her parents' deaths, she has desired to live surrounded by machines, and everyone in town thinks she's a weirdo. One day, she meets a big machine that she names Machina and treats it as a friend. Her meeting Machina, as well as meeting a potential friend in a girl named Alisa, kicks off a series of events that bring to light dangerous secrets about herself and about her parents' deaths. [tethysdust]

Wada's debut oneshot, about a mansion with a terrifying secret.