Hm, that also explains the very much half-assed "fight-system" ... not that I'm complaining, my japanese language skills can't really handle anything more complicated :P
I like TS Mahou Shoujo Nao a lot, I just find it strange that it ends when it does.
I was like "That's is? We still got 2 girls left, though..."
It also has nice clothes and gender bender, so that's a plus (for me, anyway).
By now Corruption and MC are my favourite genres so I cannot quite remember what my first encounter with it was, but i think it was an Inoino manga (Ikusa Otome Valkyrie maybe?) or a lilith game (Prison Battleship or Taimanin Asagi) or a Soushinjutsu game. But my favourites are Sailor Knight...