Going into her first year of high school, Nanami Takahashi is filled with the hope of making many new friends. After meeting the shy Yuri Yamamoto, she hears about a popular boy in their class: Yano Motoharu. Yuri cares little for Yano because of his past relationship with her older sister Nana, and at first, Nanami doesn't like his attitude either. However, Nanami soon begins to warm up to Yano and takes a liking to him. The two spend more of their time together and eventually decide to start dating. But their love is not without challenges; Yano has trouble opening up to Nanami, since his first girlfriend, Nana, died in a car accident the year before, and she had been with one of her ex-boyfriends at the time. Finding themselves living in the shadow of Yano's relationship with Nana, Nanami and Yano struggle to keep their relationship afloat amid misunderstandings and heartache with the certainty of their love for each other. [Written by MAL Rewrite]

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]