Yeah, Arrival provides a bit more context about what happened to start the events of the game. It takes place immediately before the main game starts, and is about 20 minutes long (and should only take about 45 minutes if you want to take the time to turn everything over and find all the secrets).
Viewing post in Maids & Masters v0.23.4 comments
Yeah, sounds like you grabbed one of the Maids & Re-Masters.
I didn't want to maintain separate pages for the April Fool's builds, so I stuck all the "spin-off" stuff on the same page.
Gotta make sure you grab the download that says "Maids & Masters: Arrival.rar" or you'll either get an April Fool's build or the original VX Ace version of Arrival (which is very different and doesn't transfer forward).