akane onosaka solo story, included in collection 3 of the original r-otome cg series.
rest of r-otome 3 here: https://e-hentai.org/g/3267190/e03d609028/

like parts 1 and 2, this was originally released as a browsable website, turned into gallery form here.

browsable website version:
jp original: https://files.catbox.moe/cn6dex.zip
english: https://files.catbox.moe/kyoitr.zip

r-otome 1: https://e-hentai.org/g/3267155/146053f1f7/
r-otome 2: https://e-hentai.org/g/3267156/7eda72d06a/

--------------------------------------------------------------------------------

raw:
https://e-hentai.org/g/244115/533445a6de/
https://www.ne.jp/asahi/moriya/smac/r-otome/2000.html

purchase:
https://www.dlsite.com/maniax/work/=/product_id/RJ062667.html
https://fantia.jp/products/102218

artist links (activa / smac):
http://www.ne.jp/asahi/moriya/smac/
https://fantia.jp/fanclubs/103489
https://www.pixiv.net/en/users/91048
https://twitter.com/activa_web
https://activa.booth.pm/
https://www.dlsite.com/maniax/circle/profile/=/maker_id/RG08181.html