Scaramouche [anime - your name]

Kinaso, a girl from the hinterland, and Scaramouche, a high school student from Tokyo, switch bodies in a dream. She lives the day for him, and he lives for her, but in reality they are separated by space and time. One day, Scaramouche wakes up in his body as usual, but the phrase "who are you?" is written on his hand. What the fuck is this?