I Don't Understand What My Sister's Friend Is Thinking

Manga · 2020 · Completed

Comedy, Romance

I Don't Understand What My Sister's Friend Is Thinking is a Japanese manga series written and illustrated by Rei. It was serialized on Comic Smart's Ganma! website from April 2020 to April 2022, with its chapters collected by Ichijinsha into three volumes released from February 2021 to July 2022.