The Witches' Tea Party Episode 12

The magic Roswaal is using to control the weather generates enough mana to attract the Great Rabbit, which draws closer to the Sanctuary in a massive horde. Emilia takes Roswaal and Ram to shelter in the graveyard with everyone else, but the Great Rabbit horde has already grown enough to engulf their surroundings. Just when all hope seems lost, Subaru and Beatrice appear before Emilia. So begins Subaru and Beatrice's first battle against the Great Rabbit, one of the Three Great Mabeasts.