Himegoto wa Hanazono
Tanaka Ai is a 12-year-old boy who is the youngest of his 7-brother family. After being rescued from bullies by the neighborhood 'yankees' (delinquents/gangsters), it has been his dream to become one of them. He's about to start middle school with his friend Suzuki You and his (older) twin brother Koi, when something very strange happens. Ai transforms into a girl overnight! His older brothers seem to think this is nothing out of the ordinary, but Ai is devastated. As they start school together, with Ai in his new female school uniform, Ai decides not to give up on his dream. If he tries his hardest, maybe he can become a badass lady gangster! (Source: MangaHelpers)
Sekai wa Boku no Mono
An inevitable knockout for the world! What is an idol otaku's unseen honesty?! (Source: ANN)
Women from a southern island came to work illegally in Japan in groups, and Barney is one of them. One day, as she's working she found a boy lying naked and decided to pick him up. As she was being chased by thugs, Barney decided to run away along with the boy, "Daga."
Hito wa Mitame ga 100 Percent
Jounouchi, Satou, and Maeda are three women who work as researchers but have turned their back on femininity based on various excuses. However, they begin a special research project on "beauty." So begins the comedy-filled life of three women who try and fail at being feminine in a quest for self-evaluation. (Source: ANN)
At the end of the 21st century, humans have made great advancements in technology and were able to create a giant energy source to power that technology. However, this new source of energy overloaded and turned into a more devastating force than nuclear weapons. The catastrophe wiped out the majority of human civilization and those who survived lived in terror of the anarchy that took over. Hagakure Kakugo comes from a secret family that has protected people for generations from powerful organizations and evil from taking over. They are only awoken in time of need and it has been decades since Kakugo was conscious. His body had been heavily modified by fusing it with metals to enhance both his offense and defense. He uses an armor called the Exoskull that attaches to him to greatly boost his already superhuman power. Thus begins a story about a young man and his armor's journey through hell. (Source: MangaHelpers)
Kyuuketsuki ni Natta Kimi wa Eien no Ai wo Hajimeru
In May of his first year in high school Harada Utaya became a something that's not a human being. He gained inhuman athletic abilities and was unable to continue play his beloved basketball. He changed schools and there he met a beautiful—Virgin Mary-like senior named Harushina Ayane who asked him to be her "lover" Dracula in a play?! (Source: Baka-Tsuki)
Petshop of Horrors
A smoke-filled alley in Chinatown harbors Count D's Pet Shop. The pets sold here aren't your everyday variety and the Count prides himself on selling Love and Dreams in the form of magical creatures that come with an exclusive contract. But buyers beware. If the contract is broken the Count cannot be held accountable for whatever may happen. A fascinating and macabre look into the very soul of human nature. (Source: Tokyopop)
Etsusa Oohashi Series
Set on a giant, almost finished bridge between Sadogashima and Niigata. Abandoned by the government, the bridge, and the giant man-made floating island at the center, has become a city of criminals and societal drop-outs. Set in the same world as Durarara, but 15-20 years later.
Nihonjin no Shiranai Nihongo
An illustrated collection of stories about a Japanese teacher in Japan chronicling the difficulties and experiences she faces when interacting with her students. Much of it talks about the misuse of the Japanese language (even by native speakers) and attempts to present the rectified form to the reader, but apart from that, there is also a lot of interesting information about the language itself and its roots. (Source: MU)