Watch Younger Sister full movie online Movies123. Watch Younger Sister 123movies online for free. Younger Sister 123Movies: Akio's sister, Neri has separated from her boyfriend. They lived in Kamakura. She moves in with her brother. Her ex-boyfriend's sister, Eiko comes to see Neri. She wonders if the separation occurred due to her because the three of them used to live together. Eiko's brother has disappeared in the meantime.