In the special episode to season 1, the queen from Valhalla planet arrives on earth with a virtual-world-program, called "bride training boot camp". They built several pairs which have to take a random card with a special situation that might occur if you are married. For instance Kazuto and Valkyrie have to make dinner, Raine and Kazuto's sister have to manage poverty or Akina and Hydra have to prepare a wedding ceremony as bride and groom (so everyone gets the most unlikely and unsuitable situation). The Queen from Valhalla Planet has been visiting Kazuto and the gang quite often. She tell them that she is was in Earth region for business purposes, in reality her main concern for coming around quite often is because she has concerns that Valkyrie wouldn't make a good wife for Kazuto. So she comes up with to put the gang through wedding training.