Maid-san She See

Recently, Japan has seen the birth of various girls' vocational schools for aspiring maids.
The story begins in the most prestigious of these institutes (which has an incredible success rate in the training of its students), where Hiroyuki Inagaki, an esteemed professor genuinally devoted to his profession, gets assigned 3 problematic maids-in-training.
But what are the teaching methods of the institute and, most importantly, of professor Inagaki... ?

[From a forum post by Baldo]