トレイメント～Etude～
すずのね
Suzunone is a character and key artist on "Etude" and also appears on the "Concerto" production credit.
Junpei Fujisaki
Junpei Fujisaki credited the music on the official Etude production list.
Akitoshi Sakai
Akitoshi Sakai was credited with the design on the official Etude production sheet.
ゆめざき
Yumezaki was signed as a script in the official Etude production list.
Rin Aosaki
Rin Aozaki signed video on the official Etude production list.
STB (Etude Music)
STB (Etude Music) is credited as the music in the official Etude production list.
Chikugokk
Chikugokk credits music to the official Etude production chart.
Traumend
Traumend created 'トレイメント~Etude~' and its follow-up short story collection 'Concerto', focusing on piano, composition, and character interaction.
ゆめ（Etude）
Yume is the original concept and script name for 'Etude', with the official account yume_c9.
Haku (Etude Project Signatory)
Haku was the original planner and video creditor for "Etude," and also appeared as Haku in the production lineup of "Concerto."
Kimiki Nakamura
Kimiki Nakamura credited the music on the official Etude production chart.
TEXDEATH
TEXDEATH is credited with design on the official Etude production chart.
Hazuki Saotome (Trayment)
Hazuki Saotome is a friend of Sayo Amari and the cousin of Yui Kotsuzuka. She has a cheerful personality, and her grandfather was a potter who understands the meaning of creation and expression.
Ganli Shayang
Sayo Amari is a character in the "Trayment" series. Her childhood accident took her biological mother and left her with a walking disorder; her mother's piano became her connection to her past.
Seiichi Kageyama (Trayment)
Seiichi Kageyama is a young character from "Trayment," working at a record company. His encounter with Sayo Amari changed her closed life.
Sayo Amari's biological mother (Trament)
Sayo's biological mother died in a traffic accident when her daughter was young, and the piano left behind carries Sayo's memories of her.
Sayo Amari's Stepmother (Trayment)
Sayo's stepmother once opposed her playing the piano and is a key figure in the mother-daughter relationship in Etude.
Yui Kitsunezuka (Trament)
Yui Kitsunezuka is Hazuki Saotome's cousin and also a friend of Sayo Amari, who is entrusted by her family to look after Hazuki.
Tsukino Amakusa (Trament)
Tsukino Amakusa is the lead singer of Seiichi Kageyama's high school band, later debuted successfully, and appeared in the post-story of Concerto.
トレイメント～Etude～
"トレイメント~Etude~" is an all-ages music visual novel produced by Traumend. A childhood accident caused Sayo Amari to lose her mother and now lives in a wheelchair; After meeting the young Kageyama Seiichi from the record company, she reconsiders her future with piano, family, and herself.
Traumend～Intermezzo～
Etude is associated with the original soundtrack; the album cover, tracklist, and individual track authors still require verification of the original album information.