Supermarket no Kaeri ni Doppelganger ga Deta Hanashi

I'd gone to the SuperMart like usual with my mother and brother and got in the car to go home... but I realised I was left behind? There were no cars or people around, and there was no sign of anything. I was going back home like usual ...but what happened? I know I had sat down in our car for sure but what's the meaning of this? -------- A mysterious experience that suddenly happened in your daily life. This was a winning submission in the "Horror Essay Awards" hosted by V Komi; that got illustrated into a manga.