Stories of the Great Crusch-sama Prologue: Ferris' Sudden Emergence (クルシュ様偉人伝序幕、フェリス爆誕) is a shop exclusive limited edition short story. This was later adapted and included in the Re:Zero Ootsuka Shinichirou Art Works Re:BOX.
Felix for the first time ever since their promise wears a skirt and is trying to get used to it. After walking for a bit he finds an impatient Merkart as he is trying to find Crusch, as Fourier has sent a letter warning that he would arrive today at any moment and Meckart wants Crusch to look her best as his daughter. Felix mentions that she had said she would go for a long stroll today, much to Meckart's annoyance.
Later on, Fourier arrives and asks where is Crusch, a very nervous Meckart tries to dodge the topic and chit-chat with Fourier to distract him until his daughter returns. After a while she finally returns and is scolded by Meckart for being late, presenting herself so sweaty and for wearing man's clothes in front of his highness. She mentions it was a promise with Felix were she had given away her female side to Felix, Fourier hears this and immediately orders her to tell everything about this as he doesn't like this. Upon hearing everything, Fourier requests a duel right now under the condition that if he wins Crusch will once again act like a proper lady.
At the end of the day, a very injured Fourier is being treated by Felix, Crusch mentions that her father had fainted once he saw how she brutally injuring the Prince during their duel and Felix said he felt a bit of pity for the Prince as Crusch did not hold back at all against him, Fourier thanks Felix for his healing services and mentions that he would request them again in the future.