A mecha otaku is reincarnated into another world as Ernesti Echevarria, also known as Eru. In this world, huge humanoid weapons known as Silhouette Knights exist. Dreaming of piloting those robots, Eru and his friends, Archid Olter and Adeltrud Olter, aim to become Knight Runners.
The aliens have been defeated, and the Bell has been transformed into a gigantic cherry tree. Now, the brave Magic User's Club must reconvene to deal with a new problem. Apparently, some inconsiderate persons left a skyscraper sized cherry tree in the middle of Tokyo, and it's become a major inconvenience to everyone in the city. Even though they have no idea who could have done such a thing, the Club feels strangely responsible and springs into action. Meanwhile, a mysterious person is spying on the magic club in the form of a small boy.
The story takes place in Tokyo in 2018, where normal humans and those who can use magic coexist. As a result, there are laws against using magic, and a "magic courtroom" exists to preside over lawsuits regarding magic use. In these cases, "Benmashi" or wizard barristers defend those who use magic. The anime follows Cecil, the youngest Benmashi in history, and her associates as they defend clients in these cases.
Lux, a former prince of an empire named Arcadia that was overthrown via a rebellion five years earlier, accidentally trespasses in a female dormitory's bathing area, sees the kingdom's new princess Lisesharte naked, incurring her wrath. Lisesharte then challenges Lux to a Drag-Ride duel. Drag-Rides are ancient armored mechanical weapons that have been excavated from ruins all around the world. Lux used to be called the strongest Drag-Knight, but now he's known as the "undefeated weakest" Drag-Knight because he will absolutely not attack in battle. After his duel with Lisesharte, Lux ends up attending the female-only academy that trains royals to be Drag-Knights.
Five hundred years have passed since the humans went extinct at the hands of the fearsome and mysterious 'Beasts.' The surviving races now make their homes up on floating islands in the sky, out of reach of all but the most mobile of Beasts.
Only a small group of young girls, the Leprechauns, can wield the ancient weapons needed to fend off invasions from these creatures. Into the girls' unstable and fleeting lives, where a call to certain death could come at any moment, enters an unlikely character: a young man who lost everything in his final battle five hundred years ago, the last living human awakened from a long, icy slumber.
Unable to fight any longer, Willem becomes the father that the girls never had, caring for and nurturing them even as he struggles to come to terms with his new life, in which he feels the pain of helplessly waiting for his loved ones to return home from battle that his 'Daughter' once felt for him so long ago. Together, Willem and the girls gradually come to understand what family means and what is truly worth protecting.
After the events of the Lost Logia case, Nanoha waits patiently for the day she can reunite with her newfound friend, Fate. Although being an exceptionally powerful mage, Nanoha spends her days normally with her friends on Earth. But peace is once again suddenly shattered, as Nanoha is without warning attacked by a powerful mage. A group of violent mages have been attacking anything with magic power for their own goals. Nanoha and Fate, along with their friends Yuuno, Arf, Chrono and the Space/Time Administration Bureau must once more band together to stop these renegade mages from hurting anyone or anything else. Takes place after the first season of Lyrical Nanoha.