Story involving Kensuke's brother, Ooshiba Kousuke and friend, Setagawa Masahiro from Hitorijime Boyfriend.

Masahiro Setagawa is a hopeless teenager who is often used by the neighborhood bullies as an errand boy. Defenseless, Masahiro knows that nobody will ever save him. However, his life drastically changes when he meets Kousuke Ooshiba, a man known as the "Bear Killer," who takes down neighborhood gangs. A year later, Masahiro and his former friend, Kensuke Ooshiba, attend high school, only to find that Kousuke is their math teacher. While the three grow closer, Masahiro starts to view Kousuke as his "hero," and Kousuke develops an urging desire to protect Masahiro. However, their normal lives take a turn when Kensuke's childhood friend, Asaya Hasekura, returns, seeing Kensuke as more than just a friend, much to his surprise. Will the three boys be able to live a regular high school life? Or will forbidden love keep them apart forever?

Toru Acura is a 20-year-old retired soldier meandering through life now that the war has ended. He encounters Chaika Trabant, a 14-year-old sorceress carrying a coffin, and follows her in hopes of finding meaning to his life again. The two travel with Toru's adopted sister, Akari, the employed member of the group and thus Toru's source of income.

Hitsugi no Chaika is about the quest of a pretty and charming 14-year old sorceress named Chaika Trabant, who carries a coffin on her back. She is surprisingly adept in casting high-precision spells, but she has no memory of her past. The only thing she knows is to gather the scattered remains of Emperor Gaz. Toru Acura is a Saboteur who relies on his adoptive sister Akari for their food. After the fall of Gaz Empire, he finds it difficult to land a job until he meets Chaika in the woods, and agrees to help her accomplish her quest along with Akari.

Unaired anime-original OVA bundled with 12th volume of the Hitsugi no Chaika novel.

Second Season of Hitsugi no Chaika series.

The search for the remains of Emperor Gaz continues. Chaika still in search of knowing who she really is and what her purpose is. Similarly, the Red Chaika continues the search for the rest of Emperor Gaz's remains. The Gillette corporation continues the mission to catch every last Chaika. In their adventure they give a revealing account kept secret by the Emperor, which Chaika, Fredrica, Toru, and Akari decide to uncover.

Abandoned by his parents at the age of three, Takashiro Kazuna was sent live with relatives and has grown up in the care of his aunt and uncle. Now in high school, Kazuna begins having reoccuring dreams of blood and death. Not knowing where to turn, he returns home to his parent's house to find Chizuna, his younger sister living alone in the big empty house. He learns from his sister that his father committed suicide some six months earlier, a fact that was intentionally hidden from him. When Chizuna learns about his dreams, she explains that he is suffering from the Takashiro family disease - a curse which causes an uncontrollable craving for blood - a curse that has already taken the lives of his parents and that Chizuna has been suffering from since childhood - a curse that is now beginning to effect him.

Hiyori, a small and timid girl, goes to school for the first time in a year since an accident left her hospitalized. Follow her as she struggles with her social skills, tries to make friends and maybe even a little bit more...?

Three episodes aired on TV as part of the Ribon x Oha Suta specials.

In the post-nuclear apocalyptic future in 199X, the human race has regressed. Weak villagers are reduced to slavery, while genetically enhanced giants rule the world. Gunpowder seems only a distant memory, and the martial arts is the only weapon a man can count on.Two schools face one another in the battle for dominion: Hokuto Shinken and Nanto Seiken. The series begins when the Hokuto successor, Kenshiro, travels the desert to confront Shin, a member of the Nanto Roku Seiken, their six ruling stars, who has taken his fiancee Yulia. 

In the year 19XX, after being betrayed and left for dead, bravehearted warrior Kenshirou wanders a post-apocalyptic wasteland on a quest to track down his rival, Shin, who has kidnapped his beloved fiancée Yuria. During his journey, Kenshirou makes use of his deadly fighting form, Hokuto Shinken, to defend the helpless from bloodthirsty ravagers. It isn't long before his exploits begin to attract the attention of greater enemies, like warlords and rival martial artists, and Keshirou finds himself involved with more than he originally bargained for. Faced with ever-increasing odds, the successor of Hokuto Shinken is forced to put his skills to the test in an effort to take back what he cares for most. And as these new challenges present themselves and the battle against injustice intensifies, namely his conflict with Shin and the rest of the Nanto Seiken school of martial arts, Kenshirou is gradually transformed into the savior of an irradiated and violent world.