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.
Synopsis The series is centered around Yuto Hidaka and Tsuyu Amamiya, the best friend of Yuto's younger sister Chie. Due to Tsuyu's quiet and timid personality, Yuto cannot predict what she's thinking. Unbeknownst to him, Tsuyu holds romantic feelings towards him.
Publication Written and illustrated by Rei, I Don't Understand What My Sister's Friend Is Thinking was serialized on Comic Smart's Ganma! manga website from April 29, 2020, to April 16, 2022. Its chapters were collected by Ichijinsha into three volumes released from February 26, 2021, to July 5, 2022.
During their panel at Anime Expo 2022, Mangamo announced that they licensed the series and added it to their app.
Reception The series was nominated for the sixth Next Manga Awards in 2020 in the web category and was ranked 10th.
References
External links
at Mangamo