Of course, I couldn't let the month pass without talking about a bad harem manga, but this one is both different from the rest and yet not all that different either.
HAPPY LESSON, written by Mutsumi Sasaki and Dengeki G's Magazine with art by Shinnosuke Mori. First published in 1999 and first published in North America in 2004.
PLOT:
Susumu Arisaka is an orphan who has spent the last decade in an orphanage. Now he's returning to his parents' home to attend high school. Five of his teachers learn about his predicament and are so moved by his tragic life story that they decide to all become his "mama." They move in with him, cook and clean for him, tutor him, all in the hopes of giving him a happy life...or a lot of chaos for poor Susumu.