Before the release of the offline Renpy game, Date Ariane existed as an online game written in HTML/Javascript. The “10th anniversary Edition” (2014) used many of the same pictures used in the Renpy version.

It is no longer supported or updated, but it can still be found online in a few places.
Here is one. Note: This website is not mine, if there are problems don’t contact me.

The Renpy version is also available online here.