On the dark path of swordsmanship in a "futuristic" yet feudal Japan, it is said that the one who becomes the No. 1 warrior will rule the world with powers akin to a god. Only the No. 2 warrior is allowed to challenge the No. 1, but anyone can challenge the No. 2. The current No. 2, the Afro Samurai, travels the road looking for revenge on Justice, the man who murdered his father (who was then the No. 1) in front of him when he was just a boy, a skilled gunman who became the current No. 1 after defeating Afro's father.
Sakamoto Ryota is an unemployed 22 year old who lives with his mother and spends his days doing nothing but playing video games. In the real world, there may be nothing special about him, but online, he's one of the world's top players of the combat game called Btooom. One day, he awakes on what appears to be a tropical island, though he has no memory of how he got there or why. While exploring the island, Ryota runs into a mysterious being who attacks him by throwing a strange looking bomb at him. Ryota then realizes that both his life is in danger, and that he has somehow become trapped in a real-life version of his favorite game. Ryota and the other "players" must now survive through the nightmare to figure out the reason why they ended up in the game in the first place.
Shirou Emiya lost his parents in a fire when he was young and was later adopted by a sorceror by the name of Kiritsugu Emiya. Although he was full of admiration for his adopted father and yearns to become an ally of justice, Shirou has limited powers and was unable to become a strong sorceror like his father. That is until one fateful day, he was drawn into the Holy Grail War and had to summon a female "Servant" known as Saber in order to protect himself. It turns out that the Holy Grail War involves a series of battles among powerful sorcerors to fight for the possession of a relic that will grant one's wishes, the Holy Grail. There are altogether seven "Masters" who can summon their respective "Servants" from different classes known as Saber, Archer, Rider, Berserker, Lancer, Caster and Assasin. These "Servants" have to hide their names in order not to reveal their weaknesses to the enemies. The story revolves around Shirou and his entanglement in the Holy Grail War.
Ten years ago, the magus Kiritsugu Emiya saved one lone survivor of a great disaster. As he cried in happiness, he proclaimed that by saving him, he had saved himself. The boy swore then that he would become a hero who lived to save others. Five years after the death of his foster father, Shirō Emiya finds himself drawn into a battle to the death between seven magi called Masters, where each commands the spirit of a hero of legend called a Servant in pursuit of having one wish granted by the legendary Holy Grail. In this battle, Shirō will finally have the chance to face the ghosts of his past, and to find his path to face his dreams and his future. Through the power of the Holy Grail, his wish will finally come true, for a hero of justice must have an evil to defeat.
In Osaka in the year "AD20XX," Hand Shakers are partners who can summon "Nimrodes," weapons born from their deep psyche by joining hands. In order to grant the pair's wish, the Hand Shakers compete with and fight other Hand Shaker pairs. The top pair will then meet and challenge "God."
Tokiha Mai and her sickly younger brother, Takumi, have received a scholarship to attend the prestigious Fuuka Academy. On the way, the ferry they are travelling on becomes the site of a destructive battle between two girls wielding apparently supernatural powers. This is only the beginning of their troubles, as Mai learns that she herself possesses these powers - the powers of a HiME.
The battle to find the supreme Sekirei continues. Still some of the fighters and their masters refuse to participate in the battle since losing it means to lose the Sekirei forever, and many of them actually care about their partners, while others just use them as tools. A storm is rising on the horizon, a bigger threat approaches the city and it's about to bring pain and suffering to those who love and care for their Sekireis.
Yukiteru (Yuki) Amano is a loner who never really interacts 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 it both advantages and disadvantages.