Rem Meets Subaru (レム、スバルと出会う) is a shop exclusive limited edition short story. This was later adapted and included in the Re:Zero Ootsuka Shinichirou Art Works Re:BOX.
After Natsuki Subaru's victory against Elsa Granhiert, he was brought to the Roswaal Mansion for fast treatment. The story continues with the perspective of Rem's treatment. The day after, Rem is dubious about Subaru, because his features and purposes are unknown. It seems that she does not notice the scent of the witch at this point.