Sadayo Kawakami is Ren's homeroom teacher at Shujin Academy. Though she leads a double life as an on-call Maid in order to pay debts that she owes. She does seem to truly want to be a good teacher. However her lack of time and constant tiredness from working two jobs tend to make her irritable and unmotivated.

Her voice should be in a mainly mid-low range. She tends to sound generally worn out the majority of the time as well as quite apathetic when addressing people.

You can look at the game's dub actress, Michelle Ruff, for reference.