The series takes place four years after the events of Mahou Shoujo Lyrical Nanoha StrikerS, during which, magical girl Nanoha Takamachi rescued and adopted a young girl named Vivio, who is the reincarnation of the Sankt Kaiser, Olivie Segbrecht. After entering her fourth year of elementary school, Vivio is given her own intelligence device, Sacred Heart, and gains the power to transform using her adult Sankt Kaiser mode. She soon comes across a girl named Einhart Stratos who, similar to Vivio, is the descendant of another Sankt Kaiser ruler, Claus G.S. Ingvalt. As Einhart becomes determined to prove her fighting style is the strongest, Vivio befriends her and together with her friends, enters a martial arts tournament where they fight against various magical opponents and learn more about their past lives. (Source: Wikipedia)

Six months ago, Lord Hugh Anthony Disward, also known as Huey, lost his eccentric grandfather, Sir Wesley Disward, who was a renowned collector of rare books. His grandfather's will states that, in order to inherit his manor and everything inside it, he must take guardianship over the Bibliotheca Mystica de Dantalian—an archive that contains forbidden knowledge—and also take care of a mysterious girl called Dalian. As Huey settles into the manor, an old rival of his grandfather's arranges a meeting with him. Dalian, knowing the rival to be Wesley's killer, tags along and discovers that the murderer is in possession of a Phantom Book—a cursed tome that Wesley tried to seal away. When the book puts the two in danger, Huey discovers that the Bibliotheca Mystica de Dantalian and Dalian are one and the same, and she entrusts Huey with the key to unlocking the knowledge stored within her. Together, Dalian and Huey seal the book away, and thus begins an unlikely partnership as they solve mysteries caused by other Phantom Books. [Written by MAL Rewrite]

After recovering from the inner struggles he faced in the past, Daigo Shigeno continues to play baseball and is now the captain of Fuurin Private Academy Middle School's baseball team. Alongside Mutsuko Sakura, his classmate from elementary school, he aims to lead the team to glory. However, due to unexpected circumstances, Fuurin's baseball team is left with only six members: Daigo, Mutsuko, Yayoi Sawa, Tao Sagara, Seira Kandori, and Hiromu Tanba. Left with mostly female players and lacking in experience, the team struggles to gain confidence and trust from the new recruits—Akira Nishina, Anita Kabashima, and Chisato Fujii. Facing challenges such as having no proper coach, problematic recruits, and a limited number of members, Daigo's resolution is put to the test as he tries to bring the team together in time to participate in their first ever tournament. [Written by MAL Rewrite]

Shinichi Chiaki conquers his fear of flying, and Megumi "Nodame" Noda's exceptional performance at a piano competition earns her an invitation to study at the prestigious Conservatoire de Paris. The pair go to Paris together to take the next step in their careers: Chiaki as a new rising conductor under the wing of the great maestro Franz von Stresemann, and Nodame as a pupil of the esteemed piano professor Charles Auclair. But, of course, the music world is much bigger than the two of them could have ever imagined. Chiaki and Nodame, alongside old friends and new rivals, must fight and persevere to reach the dazzling musical heights that await them while never losing sight of what matters most. [Written by MAL Rewrite]