The Great Spirit Puck's Nyan Nyan Nyan Sunny Day (大精霊パックのにゃんにゃんにゃん日和) is a shop exclusive limited edition short story. This was later adapted and included in the Re:Zero Ootsuka Shinichirou Art Works Re:BOX.
Puck searches for Subaru asking for help and tips, as Emilia seems to be rather angry with him these past days. Subaru mentions that it is his own fault for having proven with his actions that he is not the ideal role model he made himself be in front of Emilia, Ignoring Subaru's argument Puck decides that the reason is because he should act much cuter and he had been much serious these days and decides to go train poses to win Emilia's forgiveness. Much later, while Emilia is talking to Subaru about how she was still mad at Puck for lying to her, Puck appears and does his poses as planned. In the end, Emilia forgives him and Subaru slightly annoyed mentions that "a pet only misbehaves if the owner spoils it rotten". This story has ties to Librarian Beatrice's Log - Second Page as unknowingly to Puck Beatrice watches his training montage.