The story begins with Keita Suminoe, a male third-year junior-high school student studying for his high school entrance exams. He is living in a home with his older twin stepsisters, Ako and Riko, who share no blood relation to him, and they help him prepare for his exams. Even though he initially dislikes himself for it, he begins to become attracted to his two step-sisters, and his two parents encourage him to eventually get married to one of them.
Onizuka is an ex-biker and gang leader who has one goal, to become the greatest teacher. He learns of the power and respect possible as an intern teacher, using his strength and connections to get his students to respect him. Now, graduated, he gets a job at a prestigious private school to handle their 'problem class' that made the past few teachers quit. He must handle a different sort of trouble when the trouble makers include some of the smartest kids in Japan who prefer a more cerebral approach to torturing their teacher. Onizuka must slowly win his students over and deal with their mistrust of teachers while handling the distrust of his fellow teachers.
Satoru Fujinuma is a struggling manga artist who has the ability to turn back time and prevent deaths. When his mother is killed he turns back time to solve the mystery, but ends up back in elementary school, just before the disappearance of his classmate Kayo.
Shikada Kokonotsu's father owns a rural sweets shop, and his plan is for Kokonotsu to take it over one day. However, Kokonotsu wants to be a manga author instead! One day in summer, the cute but weird girl Shidare Hotaru, from the famous sweets company, comes to pay a visit. Apparently, Kokonotsu's father is famous and she wants him to join her family's company. However, he will only agree if she can convince Kokonotsu to take over the family business!
Btooom!, stylized as BTOOOM!, is a Japanese manga series written by Jun'ya Inoue and serialized in Weekly Comic Bunch and later in Monthly Comic Bunch. An anime adaptation by Madhouse aired in Japan on Tokyo MX and was streamed with English subtitles by Crunchyroll from October 4 to December 20, 2012. It has been licensed in North America by Sentai Filmworks.
In the story, Kagami Taiga has just enrolled into Seirin High School when he meets Kuroko Tetsuya of the school's basketball team. Kuroko happens to be the shadowy sixth member of the legendary Generation of Miracles basketball team. Together, Kagami and Kuroko aim to take their team to the inter-high school championship - against Kuroko's former teammates.
Shinichi Izumi is a normal high school boy whose right hand has become infected with an alien parasite that names itself "Migi" ("right"). Migi is the first parasite to develop a symbiotic relationship with its host, as he and Shinichi slowly develop a grudging friendship. Migi isn't the only Parasite on earth, however, and as cases of Parasites killing humans begin to emerge, humans seek to kill off Parasites. Shinichi and Migi find themselves caught in between these two sides of the struggle over planet earth.
Yukiteru Amano (Yuki) is a loner who never really interact with people and prefers writing a diary on his cell phone with his only companion being an imaginary friend named Deus Ex Machina, the God of Time and Space. However, Yuki soon learns that Deus is not a figment of his imagination but real when Deus makes him a participant in a battle royale with eleven others. Within this "Diary Game", the contestants are given special diaries that can predict the future with each diary having unique features that gives them both advantages and disadvantages.