Mio Aoyama
, 青山 美生
The character you're referring to is commonly recognized as the wealthy student from Maishima Academy. Despite losing her father more than a year ago, she currently resides in a dilapidated apartment. As the second female protagonist of the series, she plays an important role.
Spoilers:
Keima describes her as tsundere, based on her appearance; cat eyes, light hair colour, visible forehead and pigtails. He also claims that he has seen
