Chie-chan has a friend, Tsyu-chan, and Chie's brother has no idea what she is thinking.
I Don't Know What My Little Sister's Friend Is Thinking! is finished and has null Volumes and 17 Chapters. It is also Known as: Imouto no Tomodachi ga Nani Kangaeteru no ka Wakaranai, 妹の友達が何考えてるのかわからない, Imouto no Tomodachi ga Nani Kangaeteru no ka wakaranai (Pre-serialization) , I Don't Know What My Little Sister's Friend Is Thinking! (Pre-serialization)
Genres: Slice of Life, Comedy, Romance, Shounen
