I Was Shrunken Down And Now I'm With My Favorite Classmate JK

I drank some suspicious medicine I bought online to kill time, and my body shrank down like a c*mpass! With no choice, I went to school in my tiny body, and an unexpected turn of events happened! "Hey~! There's a cute little kid~" My classmates want to use my body for pervy stuff!! Me, who never gets any girls, suddenly finds myself in a harem situation!