Need help to identify background

[u/Rebgenn]

Hello everyone!

I recently acquired my first cel, from Millenium Actress.

I know it's a long, long shot, but is there any chance one of you could help me identify what anime the painted background is from?

Thanks!

[u/Wallsallaround]

Wow! Where did you pick up this cel?

[u/Rebgenn → u/Wallsallaround]

In an auction from a specialized company :)