The Great Spirit Puck's Nyan Nyan Tricks (大精霊パックのにゃんにゃん悪巧み) is a shop exclusive limited edition short story. This was later adapted and included in the Re:Zero Ootsuka Shinichirou Art Works Re:BOX.
Roswaal, Puck and Emilia have a small talk while going to the royal castle in their carriage, Puck mentions that The Dragon has a bad habit of choosing only women as priestesses to keep the lineage going, Emilia gets confused as to what this means, Roswaal then mentions that Puck has a very overprotective nature to Emilia for not telling the whole story about the selection for her wich Puck replies that "Emilia won't get interested for that which she doesn't know". When they finally arrive at the castle, Roswaal asks Puck for a minute of his time for a private talk far from Emilia, as they walk away, Puck notices the castle is filled with imagery of the tale of the 3 heroes, Puck considers them works of art of bad taste for being inaccurate, Roswaal then goes on the main topic mentioning that he would like Puck's help in a little scheme of his and asks him to not grow violent inside the castle, revealing that he has a feeling that someone will insult Emilia during the ceremony and that Subaru will try to protect her. Puck immediately says to Roswaal that if he told Subaru to disobey Emilia's request to not come to the castle he would fight him right then and there, a thing Roswaal denies saying that he just has a hunch and he never told anything to Subaru and then ends the conversation after Puck reluctantly agrees on the scheme.