Every person in this world changes, it could be anything like their desires or personalities. What if behind a person smiles hides a dark malice or depression? How will someone react to it if that person have the ability to see their hidden facade? This is the story of a girl who can see the ever changing form of humanity as she dives into the mysterious realms of the unknown and real life.

My boyfriend transformed into me…

Shinba, who's always isolated himself and never made friends, finds stones that contain the souls of dead famous people. With his special power, he uses the stones to be people he thinks he could never be like.

From Storm in Heaven:

Supika studies at a school that teaches the magics of astrology and astronomy. Astrologers like Supika can use three magic items, a sun, moon, or star. Supika uses the star Spica (Virgo's brightest star), which is the most powerful item she can use at her level. In the school, however, women are stuck as third class students--they aren't allowed to reach the higher levels boys can. Of course, Supika doesn?t really agree with the obsolete rule and tries to get more powerful in order to become first class. Amano, the son of the principal, doesn?t agree with Supika?s free spirit and tries to stop her from becoming a first class astrologer...

Also inclued a story called Kaede.

Yi Sol is a boy born from a strange experiment conducted by a hospital... In his high school days sixteen years later, he is hunted by a mysterious organization. And as the days pass, Sol discovers that he has a strange power related to the mark on his forehead.

From kodanclub.com:
Soon after entering junior high school, Hinata Abe is hit by a truck, but survives with only minor scratches. This earns her the nickname of "the Miracle Girl" at school.

Hinata has a creepy dream the night after she leaves the hospital. She awakes to find her room filled with flames and smoke. When she cries for help, the Virgin Mary appears before her! Mary explains to Hinata what really happened to her: Hinata actually died in the accident 3 weeks ago!

A series of mistakes stopped her soul from going to heaven. Mary tells Hinata that she is dead and it cannot be changed. But Hinata pleads for her life back. Mary agrees to offer her a chance on one condition: Hinata must save 12 lost sheep within 100 days. She starts her mission to regain her life, wearing a pendant given to her by Mary.

A miraculous fantasy love story begins.

From DoujinToshokan:
Mare is a mysterious girl who has the power to summon monsters. Mare comes to a high school looking for individuals with relationships full of envy, hate, anger, and desire, searching for unjust acts and dishing out her own brand of justice. What is her purpose, and what challenges await her? And what awaits the students here with her arrival?

Alma is born a witch after her father makes a deal with the demon Mephisto. She seems to be able to travel through time and goes back to the middle ages in Europe, the Mayan / Aztecian time as well as the Roman ancient time and Nazi Germany.

From NOIR:
Memory eaters live on people's memories. They are originally death messengers who remove a human's memories when they carry souls. But some of them are charmed by the beauty of the memories and become Exiles: Memory Eaters. Dio is one of them, but instead of stealing human memories like other Exiles, he earns them by helping people. One day, Dio finds a girl who is losing too many memories from Exiles. He tries to help her, but Ces, who was a model death messenger, is around her. What is he doing here?

This award-winning classic story focuses on Marlee, an agent of the space empire sent on a mission to track down the opera singer Eroccus. There are three intertwining narratives which span planets and hurl the readers back 30,000 years in time. The narrative takes place in a non-linear fashion, unfolding across space and time, before folding back upon itself at its culmination.

Note: Winner of the Seiun Award in 1983.

Note 2: Gin no Sankaku was not serialized in a manga magazine. Based on content, it could be considered either seinen or josei.

Niu Qingqing is a regular 14-year old girl with a close cousin who is obsessed over Hanfu, or Han Chinese traditional clothing. Qingqing encounters a 'cute' mysterious young boy in early 17th century garb in her cousin's university campus one day, and decides to join the Hanfu club to find him...

"The 20th Century saw a massive conflict between humans and Monsters, with the Monsters winning the hard-fought struggle. As a new century dawns, memories of those times have utterly faded from the minds of men." Monsters rule from the shadows, while humans continue life with a semblance of normalcy, all the while in secret fear. Some try to win favor with the Monsters, offering sacrifices of children. Most turn a blind eye and pretend they don't exist. But there are a few, the Melos Warriors, who continue to fight the Monsters and seek the Melody of Oblivion, a mysterious girl said to hold the key to salvation. Young Serina Bocca awakens as a Melos Warrior and begins his journey in search of the Melody of Oblivion.

A collection of four short stories.

Suna no Ue no Rakuen (砂の上の楽園)
Yoru no Mori no Soko ni (夜の森の底に)
Boku wa Tabi o Suru (僕は旅をする)
Ame ni Nareba ii (雨になればいい)

Chapter 1 is the 100-page title story. It's a supernatural fantasy tale about a man with one chance to escape from death, a mysterious woman he meets, and a tribe seeking to find its way back into Heaven.

Chapter 2 deals with the mystery of a man gone missing, and presumed dead.

Chapter 3 is a very short story about a couple in the mountains who pick up a strange guest.

Chapter 4 is a longer story about the traditions binding a family, those that would break away from them, and the dark secret that holds the family in sway.

From Fantasyshrine:

For the sake of his little patient, Resident Doctor Yashiro Takashi agreed to a bet with the beautiful doll maker, Kuze Shinobu, who claimed to be his “destined one”. Unaware of their intertwined fate, Takashi had bonded himself with Shinobu in a spirit marriage.

From Storm in Heaven:

Possessing extraordinary detective skills and even helping out at the police department can't be normal, and anyone who knows Uryuu Nanao knows that she's different from the rest. It is this distinctiveness that draws both Karasuma Nozomi and Sakuragawa Nozomi to her despite Nanao's attempts to distance herself from them both. However, a series of murders take place and Nanao is forced to enlist their help in order to unravel the truth behind her father's murder. Just who is the real mastermind behind the ongoing murders and why are they targeting Nanao? And what is the secret left behind by Nanao's father?

At his classmate Mamoru Takayama's funeral, Mizuno runs into boy of the hour--Takayama! Takayama is apparently unable to rest in peace because he has a lingering attachment to this world. His unfinished business is to steal Mizuno's lips! Will ghost Takayama's wish be fulfilled!? Also featured in this volume is an epilogue of the story plus a bonus romance story entitled "Gift."

Legend has it that if you take your guitar and stand at a crossroads at the witching hour, the devil will appear. He'll grab your instrument, play a song, and hand it back to you. You'll walk away an expert bluesman, but you'll have to pay the price: your immortal soul.

Won the 2009 Glyph Comics Awards in the Best Reprint Publication category.

From here.
Milk Crown is a story about a 15-year old girl named Tachibana Oto who leaves all her brothers and sisters at the orphanage to go work as a maid in a high school with a dorm (naturally, she will also be taking classes at this school, like everyone else). At this new high school dorm she's staying at, there are some pretty crazy people.

Oneshot epilogue for the Girls Bravo's story that was released in an extra booklet for a deluxe edition of Girls Bravo.

What happens when Kirie finally faces her feelings? Will she finally find a closure?
The funny answer to a question never pursued.

From Divine Sanctuary:

Wakako has a secret crush for her 2-year-older childhood friend, Chii-nii, but he went away before she had a chance to tell him her feelings. Meeting him again after 3 years, will Wakako finally be able to pluck up her courage and say those 3 simple words?