Shortly before the start of a new semester, Misaki Fujioka visits her twin sister Mei Misaki in Yomiyama City. The girls make full use of the last days of summer, roaming around a heat-weary town and visiting various places including a shopping center and shooting stall. When they prowl around her basement, Mei expresses uneasiness about her new class, which is said to be cursed. Craving more entertainment, the twins decide to pay a visit to the local amusement park. But the leisure of a sleepy summer day could soon turn woeful as Mei sees the color of death on her sister—an unmistakable omen that a tragedy is bound to strike. [Written by MAL Rewrite]

An extension of the summer-arc in the Air TV-series, showing more of what happened during Kanna's, Ryuya's and Uraha's journey to find Kanna's mother.

Nanba is the world's most formidable prison, built to incarcerate criminals who are too slippery to stay in ordinary confinement. The four inmates who occupy Cell 13 are particularly cunning on that behalf, having escaped every other prison with a perfect success rate. There is Juugo, a specialist in locks who has spent the majority of his life in prison; Uno, a gambler with great intuition; Nico, an otaku whose body reacts strangely to drugs; and Rock, a bruiser with a love for food. The daily shenanigans of the four prisoners always cause trouble for the building supervisor, Hajime Sugoroku, who desperately tries to prevent them from breaking out of Nanba. Nanbaka follows the comedic, sparkle-filled exploits of these prisoners and their guards. From three square meals a day to sports festivals, prison life in Nanba isn't actually that bad—and it is the closest these four have to a home. [Written by MAL Rewrite]

Manji is an infamous swordsman in feudal Japan who is known as the "Hundred Man Killer," as he has killed one hundred innocent men. However, there is something far more frightening than his ominous reputation: the fact that he is immortal. This is the handiwork of eight-hundred-year-old nun Yaobikuni, who placed bloodworms capable of healing almost any wound in Manji's body. To atone for his crimes, Manji resolves to kill one thousand evil men. Yaobikuni agrees to this proposal, saying that if he succeeds, she will undo his curse of immortality. Soon after this promise, Manji meets Rin Asano, a 16-year-old girl who requests Manji's assistance in killing those who slaughtered her parents. Initially reluctant, Manji refuses Rin's desperate plea. However, owing to her evident lack of strength, Manji changes his mind and agrees to protect Rin for four years. With this partnership set in stone, the two embark on a perilous journey of bloodshed, vengeance, and redemption, each to fulfill their own life's cause.