Distinguished mages Nanoha Takamachi, Fate Testarossa, and Hayate Yagami now work as military personnel for the Time-Space Administration Bureau on the planet Midchilda, having completed their studies on Earth in the last ten years since the "Book of Darkness" incident. One day, the three end up helping the Bureau respond to a severe airport fire, but their efforts are left unrecognized. A series of unfortunate events motivate Hayate to create the elite unit Riot Force 6, which handles cases involving public safety as well as dangerous magical objects known as Lost Logia. There the trio works alongside promising recruits Subaru Nakajima, Teana Lanster, Caro Ru Lushe, and Erio Mondial, who endure difficult training to fulfill expectations while overcoming hurdles and achieving personal goals. However, carrying out their mission proves to be a constant struggle. Battling foes who exploit the Lost Logia and facing criticisms from within the Bureau, Riot Force 6 quickly finds itself stretched thin.

Struggling yet brilliant 19-year-old Minato Sahashi has failed his college entrance exams for the second time, resulting in him being regarded as worthless by those around him. However, the course of his seemingly bleak future is altered dramatically when a beautiful, supernatural woman falls from the sky and into his life. That woman, Musubi, is a unique being known as a "Sekirei," a humanoid extraterrestrial with extraordinary abilities. These aliens are known for kissing humans carrying the Ashikabi gene in order to awaken additional latent powers deep within. Recognizing the potential within the seemingly insignificant youth, Musubi kisses the bewildered Minato, initiating a bond between the two of them. This drags him into the high-stakes world of the Sekirei, where he and his new partner must compete against others in a battle for survival called the "Sekirei Plan." However, unbeknownst to the contestants, there is far more at risk that what the competition initially entailed.

The second stage of the battle royale known as the Sekirei Plan is underway. Shintou Teito has been closed off; no Sekirei or Ashikabi may leave. Minato Sahashi and his harem of Sekirei must now prepare to fight new battles as changes to the rules are put into place. However, not all groups will return to the battle: some Sekirei are loved very much by their Ashikabi partners, who would rather forfeit the prize than see them perish. In the midst of the action, someone close to Minato may be more involved than he had ever imagined, and threats lurk around every corner. There are even rumors that the "Single Numbers," the most powerful type of Sekirei, have entered the fray. In the eyes of the "Game Master" Minaka Hiroto, everything is proceeding according to plan.

Can a relationship between a regular college student and an idol singer survive? That is the question that White Album tries to answer. Touya Fujii is a normal college student with normal worries—namely balancing his classes and his job he works to pay for school. He is also concerned about the amount of time he has to spend with Yuki Morikawa, or rather, the lack of it. Being an up and coming idol singer, Yuki has concerns of her own. Even though she's not yet as popular as experienced veteran Rina Ogata, Yuki is turning heads and landing interviews on television. This should be a good thing, but not everyone is happy about the attention she receives from the media and from Rina. The idol industry is surprisingly cutthroat, and rival singers have their eyes on Yuki. While it may seem exciting to watch your girlfriend on television, how does Touya really feel about all this? Between the challenges associated with Yuki's career and other people that Touya meets at his university, their relationship may not last…