So... is Kamen no Maid Guy finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 22, 2008
Manga finished: March 09, 2012
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Kamen no Maid Guy centers around Naeka Fujiwara, a seemingly ordinary high schooler who secretly stands to inherit a vast fortune upon turning 18.
Her life takes a turn when two unusual maids, the attractive Fubuki and the muscular, masked Kogarashi, enter the picture.
These maids are tasked with protecting Naeka and her brother, Kousuke, from those who seek to harm them and seize the inheritance for themselves.
The anime follows their hilarious and action-packed efforts to safeguard the siblings and ensure Naeka reaches her 18th birthday unscathed.