In a world where flying is as simple as riding a bicycle, there is a popular sport called "Flying Circus" (dogfight race). The protagonist who once hoped for a future in this sport suffered a setback due to an overwhelming defeat, and withdrew from the sport for this and some other reason. However, he met the transfer student Asuka Kurashina, and in teaching her to fly the skies, the old passion returned. He takes part in the Flying Circus again.
Aoba lives on Hekishima, a small island to the southwest of the main islands of Japan. He lives with his grandmother Tae while working part time at a junk shop. The popular pastimes on the island are the ongoing turf war called "Libstease" and an online game set in the virtual world of "Rhyme." Aoba isn't involved in either, preferring to live peacefully, until one day he is forced into a Rhyme battle.
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.
Yuichi Aizawa returns to this city after seven years. In his childhood, he often visited it, but something happend in the past which caused him to block out his memories of the events of seven years ago. On the day after he gets settled in, he meets a girl carrying a backpack with wings on it. Her name is Tsukimiya Ayu and he begins to recall the memories he had lost.
Yūki Ōjima attends Takafuji Private Academy, a large school with over 6,000 students, where he is a member of the Food Research Club along with seven others, including his childhood friend Chisato Sumiyoshi. The members leisurely spend their time in the club doing very little. When the election for the next student council president comes up, the front runner Satsuki Shinonome proposes that clubs which have no merit should be sorted out and abolished. The Food Research Club seeks advice from the current student council president, Yakumo Mōri, who suggests that Yūki run in the election as an opposing candidate. Yūki learns about the issues facing the school and decides to run in the election.
The story picks up immediately after the events of Grisaia no Meikyuu, with Kazami Yuuji having been detained for suspected involvement with an international terrorist organization, lead by Heath Oslo, that has managed to enter Japan's borders with a devastating new weapon of mass destruction in hand. Meanwhile, at Mihama Academy, the remaining students find themselves with time running out. Due to financial issues, the school is set to close within the month. Over the past year, though, the girls of Mihama have finally begun to find their own legs, thanks to Yuuji's involvement. Are they really just going to bury their heads in the sand and let the world change around them? And are they really willing to let the man who changed their lives slip away without so much as trying to win him back? As the end of their time at Mihama Academy approaches, Amane, Makina, Sachi, Yumiko, and Michiru find themselves arriving at a single conclusion.
How much a group of students can do in the face of countries and organizations far bigger than any individual could hope to be remains to be seen. In the first place, Yuuji's position is far more complicated than any of them could have imagined, as he finds himself embroiled in an elaborate game of super-political chess revolving around both himself and an inconceivable new system slumbering in the depths of CIRS—a system that Yuuji may have more of a connection to than he thinks. One thing is for certain, though—the girls of Mihama are no longer willing to let the world steal things away from them without at least a bit of resistance first. And with help from a mysterious individual known only as Thanatos, they may just achieve their goal...
At private Mihama Academy, five girls who seem normal attend the school due to "certain reasons." A sixth student "with reasons" named Yūji Kazami transfers in. Yūji has an ego with such darkness that he does not fade in comparison to the five girls, who are so different from the norm. As they each meet each other, they deepen their understanding of one another. Through the small bits of progress they make, each of their hearts will be affected. When Yūji arrives, a story of girls who are trapped by their pasts begins.
Walkure Romanze's story revolves around Takahiro Mizuno, a student studying at an academy with jousting as its main focus for sport. Takahiro acts as an advisor to the riders of the sport. Takahiro goes through each day tediously until the time of the annual competition draws near. Due to some odd circumstances, his childhood friend Mio Kisaki is enrolled into the competition. As she has never even rode a horse once in her life, Takahiro senses the fear in his friend and becomes Mio's coach.
Haruka Kasugano and his twin sister Sora have lost both their parents in an accident, and with them all their support. They decide to move out of the city to the rural town where they once spent summers with their late grandfather. At first everything seems familiar and peaceful, but changes come as Haruka starts to remember things from his youth.