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.

A God Eater consumes the power of impure gods and gains their strength. Koutaro is one of these people. Because of the discrimination and danger that he faces he doesn't have anyone close to him besides his familiar spirit Hinaki. But all that changes when he meets the cheerful Miko, Amane, who is determined to be his traveling companion.

From Storm in Heaven:

In order to sustain a world on the verge of death, two groups, Blanches and Noires, vie for dreams.

Every six months, the group with the fewer dreams has to send a number of members to the human world, where they will eventually die. Heki, a Blanche, fights to get ahead of the game, so he doesn’t have to see his friends shipped off... again.

Ikagawa Tokage is a boy with a superpower. He has the the ability to change the color of his eyes whenever he closes and reopens the eyes. Kinda useless, right? Regardless, Ikagawa Tokage strives to strengthen his power in an effort to become the strongest and not have his power be nothing more than an arrow to the knee. With that desire in mind, he trains daily in an abandoned building in modern day Tokyo. But on one such day, he comes to what looks to be a scene of a crime and feels the culprit might still be nearby. Will he make it out of the abandoned building with a broken knee? Is there more to his power than meets the eye?

1-2) Kare to Kare
Masaru has been avoiding his childhood home, and his little brother, for about 5 years. But when he finally returns, his little brother hasn't forgotten their past together... or forgiven him for running away from it.

3) Love in Room 501
Two childhood friends have grown apart in highschool. One's a good student who expresses himself sincerely and the other is a flippant dick-head. While the jerk exploits his feelings, the good student struggles to come to terms with the reality of their relationship.

4) I Want That Moon
Two office workers go on an onsen vacation together only to become vehicles for the vengeance of a ghostly murder victim

5-6) Let's Make a Band
A group of teachers form a Visual Rock band in their spare time and hire one of their students as a member. Unfortunately the band is such a neurotic mess, they can't seem to get their act together long enough to play anything.

After 2050, Tokyo. The sixteen-year-old gifted police detective Kyouko Karasuma works for a special devision in the Asakusa Police Department. Her rather abnormal cases involve: fighting oni, tengu, and other monsters from Asian myths and legends. The modern art by the character designer of Speed Grapher works very well with the action-heavy story line and the overall art improves with each volume.

Kagura is a professional slacker with nothing but a part-time job and cram school to keep him company. When a little girl suddenly shows up in his house one day, he thinks things can't get any weirder... until she starts calling him "Daddy"! It's hard enough taking care of an ordinary child, but Kanna -- who doesn't speak his language, isn't from his dimension, and has hordes of evil minions hot on her heels -- is anything but ordinary!

Kugaya is a teenager who lives with his aunt, Sakuri.
The kendo coach at his high school, Narugami, has been after him to join the kendo team; but when he meets the new girl, Takemi, his life takes a supernatural turn and he is thrust into an epic battle with the demonic "Intruders".
Reincarnation... buried memories... the Holy Sword... "Himuka"... and the Clan of the Swordsmen... it's all too much for a high school student to bear!