Souma Ria

A moody, delinquent girl in a different class from Ouro. She's a smoker and has been suspended a number of times. Ria has quite the foul mouth, seems bored with everything, and has become incredibly cynical.

She's developed a reputation for being a hoodlum, so only happy-go lucky people—like Reina—approach her.

"Tch, don't tell anyone. Not about this place, at least. This is my special seat."

Spoiler

In an alternate timeline, it is revealed that she survives her surgery and is the wife to Ouro, avoiding death.