Season 4
1Sacred Heart
25 minApr 3, 2015
On the magical world of Midchilda, Vivio Takamachi is a 10-year-old girl who lives with her adoptive parents, Nanoha Takamachi and Fate T. Harlown, and goes to school with her friends Corona Timil and Rio Wesley. To celebrate Vivio entering her fourth year of elementary school, Nanoha decides to give her her own rabbit-shaped Intelligent Device, which she decides to name "Sacred Heart" or "Chris" for short. Using her new device, Vivio transforms into her mage form, taking the adult Sankt Kaiser form she previously used during an incident several years ago, which comes as a surprise to Fate. As Vivio does some late night training with Nanoha, her Strike Arts instructor, Nove Nakajima, hears about a girl going under the name of the Sankt Kaiser Heidi E. S. Ingvalt who has been attacking various people. The next day, after Nove accompanies Vivio to visit her comatose friend, Ixpellia, she is challenged by the self-proclaimed Ingvalt.
2Einhart Stratos
25 minApr 10, 2015
3True Feelings
25 minApr 17, 2015
4Brand New Heart
25 minApr 24, 2015
5Surprise Attack
25 minMay 1, 2015
6Matchup Duel
25 minMay 8, 2015
7New Stage
25 minMay 15, 2015
8Rival
25 minMay 22, 2015
9Intermediate Championship
25 minMay 29, 2015Now viewing
10For Victory
25 minJun 5, 2015
11Hegemon's Fist, Creator's Desire
25 minJun 12, 2015
12Meaning of Ending a Match
25 minJun 19, 2015