From SCX-Scans:

Once upon a time, there was a courtesan who fell in love with an impoverished Noh-mask maker. However, when her lover rejected her, the courtesan threw herself from a bridge in dispair. She left behind a note cursing him and his descendents. In current day one of that man’s decendents, Izou, discovers that the guardian mask at his temple has cracked and the ghost of the past has come back for her lover.

One fateful evening, as Sevi is coming home from a late night shift at the cafe where he works, he encounters Hornet, a lovely vampire - who also happens to be starving for hot blood after a rowdy night out with his vampire brethren. Hornet is suddenly seduced by the sweet smell of Sevi's blood and cannot control his urge to get a taste! Fortunately, Hornet is allergic to human blood and cannot bite him. Instead, they must satisfy their lustful desires by "human ways" - sex, of course!

Sayoko was just reading peacefully in her backyard, waiting for her relative Iyahaya Nantomo to arrive, when some homeless kid in a large overcoat suddenly comes in and says he's Iyahaya Nantomo (?) and runs off. The guards catch him and bring him in, but then it's revealed they've made a mistake and technically kidnapped him! So to save face the boy has to pose as Iyahaya Nantomo...or else!

From Supreme Cream Scanlations:

Somewhere, nowhere, a place where life meets death, where consciousness surrenders itself to oblivion. Who might one find at such a crossroads?

Note: Each original chapter is accompanied with a BGM that adds to the ambience, so it’s recommended to click the original webtoon link while reading the adapted version.

Prequel and side stories from the main story of Needless Manga. Volume 1 also contains prototype one-shot "NEEDLESS 1.5".

~A cursed forest and the castle inside it. Lynn is a young, pretty girl, who is an illegitimate daughter of a wealthy baron. One day, she is chosen to become the sacrificial bride for the Lord who lives in a cursed castle in the woods. This is Lynn's story. ~This is a Naver webtoon. http://comic.naver.com/bestChallenge/list.nhn?titleId=541226

Misaki is a 30-year-old virgin who has a bit of a crush on one of his co-workers, a pretty girl named Amano, but he has no experience and no clue what to do. Fortunately for him, he has an ecchi guardian angel…

From MangaHelpers:
A collection of five spooky stories:
1) Tenchi Shinmei by HINACHI Nao & AMENO Hirume
Asuna Shio is a teenage girl with a very strong perception of the spirit world and has a shrineless god as a companion. One day, Shio's classmate is seen vanishing into a mirror. She reappears afterward, but seems changed for the worse in terms of personality. What has happened to her?

2) Gekkouchou ~Hyaku-nen no Koi~ by MOKOYAMA Jin
A two-tailed tiger-striped cat is taken in by a girl called Mitsu and given the name Torakichi. Torakichi is no ordinary cat, and the love and tragedy between them may be strong enough to transcend a simple lifetime.

3) Friend Doll by TACHIBANA Azusa
Mizuno Sachi spends almost all of her time studying, thanks to her demanding parents, and she doesn't really have friends. There's a boy she likes at school, but it seems impossible to get close to him. Suddenly, her stuffed bunny, Mimi, starts showing up in her dreams to advise her through her teenage life. But what is Mimi's motivation for all this help?

4) Tonari no Yomi-san by UMENO Hana
There's an urban legend about a girl who killed herself as a teenager, "Yomi-san," due to her insecurity over her appearance. Supposedly, her father stuffed her body, and, in her quest to become beautiful, the body seeks to take parts from pretty girls. At one school, several pretty girls have been mysteriously injured. Could the culprit be the dead girl, Yomi-san?

5) Oni no Sumu Shima by NANAMI Sora
Saki moves out to a rural area, where she has no friends. In her loneliness, she goes out to an uninhabited island, where she meets a new possible friend. He's a demon, but as Saki gets to know him, she finds him less and less frightening.

Hayate and Choko are twins who are as different as night and day. Choko acts like a shallow princess whose main concerns are her looks and cute things, while Hayate is the cool but overprotective brother with a penchant for sabotaging potential relationships for Choko. Naturally, Hayate plans to act accordingly when Chouko confesses to the school's prince, Tsukiyono (albeit, mainly for his looks).

After an argument over Choko's love life, Hayate and Choko end up tumbling down some stairs together, and bizarrely find they've switched bodies. Even worse, and much to Choko's horror, Tsukiyono starts to fall for Hayate who is now in Choko's body.

Because she killed herself, Sagiri became one who escorts souls of those who have died, instead of going to heaven. She met Hisagi while he was crossing the river of the world of the dead... They promised they would meet again and live happily in their next lives... Can their promise be fulfilled?

From Tokyopop:

To survive a fatal train wreck, Sekai Maihime is thrust back in time where she discovers she has hidden powers that are connected to a doll, 'S.' She is both aided and limited by 'S's' vague (but kind) guardian, Sovieul, who is the cause for Sekai's presence in 17th-century France. Sovieul vows to protect Sekai, but offers little information as to why these strange events are happening.

Unfortunately, they encounter Machiavello (also referred to as the Devil) who looks a lot like Sekai's childhood friend and love, Midou. Machiavello covets the powers shared by Sekai and 'S' so he may obtain the power of the Devil R. Sekai only wants to find Midou and return to her time, but she's constantly hindered by her conflicting desires with 'S' and by Machiavello's attempts to obtain her body.

To find Midou, Sekai must cooperate with 'S' and Sovieul to traverse through time while avoiding Machiavello.

Something strange is going on in "Soil New Town." The sudden disappearance of a seemingly normal family leads the two detectives Yokoi and Onoda to the idyllic town in the middle of nowhere. What looks like a routine case at first quickly turns into a complex and deadly riddle where nothing is what it seems to be. Will the two disparate investigators manage to solve the mystery before it's too late?

Chu Ming Yang is an extremely unfortunate high school student who accidentally enrolls into an academy of a dubious nature, where it is the norm to jump in front of moving trains, get dismembered during orientation, and crushed by vindictive bouncing classrooms. Can he stay alive or will he die from the rigors of school? Why have evil spirits suddenly acquired a taste for his flesh?

1. Sanbika
In a far country ruled by a beautiful Duke who seems to have formed a peculiar relationship with his right hand, Lord Yuri, there are cases of unexplained deaths... they would involve a vampire according to the spreading rumour.

2. Killing Moon

3. Life of the Machine
Koreya Takane, a famous scientist, had enough of the constant obligations required by his position when all he really wants is to be left alone with his work. That's how, in order to satisfy his taste for solitude, he build up a mechanical clone of himself... But what if it becomes impossible to distinguish the replica from the original man in the end?

4. Prince of Monster
A kind prince with strange red eyes who had been locked up by his uncle decides to end his misery... without knowing the grief it'll cause to his brother. He suddenly reappears 13 years after but what if he really has become the “Prince of Monster” as he used to be called?

5. Bye-Bye Mizuhara

Riu is the only daughter of Kioka Saenji, the 11th generation head of the famous Rokugi Kabuki theatre house. Since she was small, she has had a recurring dream about a man under the red moon - a man she didn't know, until she attended one of the performances of her brothers. The man turns out to be Rui, one of the heirs of the Akatsuki house.

The Akatsuki House is distantly related to the Rokugi House. Just recently, the 10th head of Akatsuki House, Ashikawa Enjuuro, died. The family is on the process of choosing his successor among the three adopted sons, one of which is Rui.

What relation will Riu have with Rui? Why does she dream of him dying every night?

Two brothers encounter something strange on their way home from the train station.

The manga follows the story of 16-year-old Mana on an adventure through the Aquarian Age. A sixteen year old girl, Mana returns to her hometown to reunite with her childhood friend after having been gone for seven years. But her friend, Kaname, seems to have changed too while they've been apart. Mana's re-emergence soon sets off a series of events that alters the lives of Kaname and his best friend, Naoya. Classmates Isshin and Tsukasa, as well as their teacher Tomonori, find themselves drawn in as well. Soon, they all discover that they have a part to play in the "Aquarian Age" - a war that has been secretly raging for thousands of years. Now the future of the world depends on one girl and her destiny.

Jutten! is about a boy who goes to his first day of high school, thinking it'll be full of awesome (pervy) meetings with sexy girls and whatnot, but instead has a lot of bad luck and gets peed on by a dog--amongst other things. A girl who uses her bike to drive over his ass sorta helps him and gives him a handkerchief with a 10 yen coin in it (hence the the serie's title) and ... very plausible stuff happens afterwards.

A man suddenly gets off the train at some rural station, and soon comes to realize that this town can't be found on any map. Even stranger are the manners of Uroshima's townspeople - because over there people are doing it openly on the street, in broad daylight, just like you'd say "hello" to somebody elsewhere.

And there are many other things being weird about this little town Uroshima, seasons are randomly coming and going, and our protagonist meets the woman of his life. Shouldn't be hard to get her given the prevalent manners...

A selection of short stories. The stories deal with the same themes as Parasyte and his other work, and in only one of them is his art style noticeably more primitive.