The story of the OVA takes place after Subaru and his friends defeat the Wolgarm, the source of the curse, and save the children of the village of Irlam. The characters finally get a moment of peace, and Subaru goes on a certain secret mission that he shouldn't let anyone find out. However, despite Subaru wearing a costume, Petra and other children from the village immediately discover who he is. Now that her mission was exposed within five seconds of starting, what will happen to Subaru's "date" with Emilia?