If you're looking for manga similar to Another, you might like these titles.
Teiichi Niiya is a first year middle-school student at Seikyou Private Academy, an institution known for mysterious occurrences. The boy quickly finds these rumors to be true when he meets Yuuko Kanoe, a beautiful, mischievous girl who quickly takes a liking to him... and happens to be a ghost who seemingly no one else can see! Unable to remember anything about her past, Yuuko enlists Teiichi’s help to discover the truth, and together they join the school's Paranormal Investigation Club. With fellow memebers Momoe and Kirie, the pair will investigate the many strange happenings around campus, including the shadowy circumstances surrounding Yuuko’s death.
Both of these series are dark tales of a boy and a ghost-girl. In addition to the plot similarities (a guy in school encounters a ghost girl which only he can see), both series have a similarly dark atmosphere.
Dark, ghostly, gloomy.. if you like these themes, "Another" and "Tasogare Otome x Amnesia" are just for you (^.^)
26 years ago, in a third-year classroom of a middle school, there was a student named Misaki. As an honors student who was also good at sports, the charming girl was popular with her classmates. When she suddenly died, her classmates decided to carry on as if she was still alive until graduation. Then, in the spring of 1998, a boy named Kouichi Sakakibara transfers to that classroom, and he grows suspicious of the fearful atmosphere in that classroom. In particular, there is a beautiful, aloof girl named Misaki Mei who wears an eyepatch and is always alone drawing pictures.
Old curses and mysteries combine for a creepy effect in both. Another is the darker of the two though, as comedy and romance lighten up the storyline of x AmnesiIa in stark contrast to the horror aspect of Another.
Tasogare Otome X Amnesia isn't as gruesome and horror filled as Another but the story line is equally similar
Karugasaki Tora decided to repeat a grade and turn into a delinquent just so he could be popular, on his best friend's advice. However, his plan backfired and nobody talks to him in his new classroom. The only thing he can look forward to is seeing the cute girl sitting next to him, but after trying to talk to her she immediately kicked him and threw him out the window. Later the same day, though, he saved her and a little girl from being hit by a truck. No longer able to avoid him, the girl reveals that she's a ghost playing a shinigami's game. She must get the boy she likes to return her feelings at times given by a pair of hourglasses so she can return to life, or fail and be sent to hell together. Unfortunately, her feelings have awakened for Karugasaki...
In each of these mangas there is a guy who encounters a strange girl in his class, a girl which only he can see. A girl who seems to be a ghost. Ushiro no Shindere-san is a lighter, more comedic take on the general plot, while Another takes a darker, more tragic view.
In the recesses of mountain... there's a bus stop at outskirts of a village, it's called "Hinamizawa bus stop". Rika, a female high-school student, together with her junior, Mion visit this place. Twisted relationships that are concerned with the dam construction in Hinamizawa, and the stories of the curse of "Oyashiro-sama" that takes root in this area. What waiting for them is a tragedy, or else...?
Years ago, a kidnapping incident left a pair of victims with lasting psychological scars: Maa-chan is prone to violent mood swings, while Mii-kun's pathological lying shrouds his life in mystery. Now, when the news begins airing stories of kidnappings and serial murderers, Mii-kun moves into Maa-chan's house, in an effort to protect this girl who he has been through so much with. But can he save her from herself?
When Kyung-do was young, his father brought home a mysterious book from his book club, dying shortly thereafter. Now, as a teenager, Kyung-do is an avid bookworm whose fate appears to be tied to the same sinister tome, and he's not the only one – the school librarian commits suicide after reading it, and others are rumored to have been killed for similar reasons. Now, Kyung-do and his classmate, Eun-sae, must try to discover the truth behind the deadly book to save the boy from his fate, while others investigate these events for their own reasons.
Long ago, Tenshin Elementary School was torn down after a teacher fell down the stairs and died. In its place, Kisaragi Academy was founded, a place where Satoshi, Naomi and their classmates attend class. They and other members of Class 2-9 have stayed after school one day to prepare for a cultural festival, but when a strange earthquake occurs, the group finds themselves stuck back in time at Tenshin Elementary, unable to see each other or escape. Now, the students must try to find each other and a way back to their reality, before they too become nothing but a corpse.
It's been almost a year since Natsumi and her family moved from the town of Onigafuchi. Her grandmother, a native of Hinamizawa village, fears that they will be cursed for abandoning the mountains, but Natsumi has never been happier, making new friends and enjoying school life. When a terrible gas explosion in Hinamizawa wipes out everyone in the village, her grandmother is convinced it is the wrath of the village god, Oyashiro-sama. Natsumi's family has never taken Grandmother's beliefs seriously, but her devotion to Oyashiro-sama has taken a frightening turn. Have the old woman's fanatical convictions gone too far?
In the seemingly-normal small Japanese town of Kurozu-cho, odd events are beginning to take place. Residents are becoming obsessed with spiral - whirlwinds, snail shells, pottery, or anything with a spiral design. But when strange events start happening in the town, with spirals appearing in disturbing places, can anyone escape their horrible draw?