Amemori Sayo (雨森小夜) is a female Japanese Virtual YouTuber and member of Nijisanji (formerly of Nijisanji SEEDs).
A second-year high student on the library committee.
Sayo made her YouTube debut on 12 August 2018 with a series of short videos following a surreal story.
- Color: #756F7D 
- Sayo does not livestream often, but when she does, the time is usually after midnight or very early in the morning.
- Sayo's type of uploads are relatively unorthodox compared to other corporate VTubers, because she often includes real life images, visual or performative tricks, short-form humor, and other oddities.
- Notable units within Nijisanji:
- She has the same illustrator as Elu, Shibuya Hajime, Fushimi Gaku, Kenmochi Toya, Sister Cleaire and Todoroki Kyoko.
- 雨森小夜 - YouTube channel
- Sayo's corporate profile on the official Nijisanji website
- @sayo_amemori - Amemori Sayo's Official Twitter account
- 雨森小夜- Unofficial Nijisanji Wiki