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"Why does everything in my life go wrong...?" 
"How much longer do I have to live like this...?"
"Will my tiny, puny wish for peace..."
"Be taken from me too...?"
Her name, is Akane Kuromi. From the Doujin work, "Anta to Tada no Rigaikankei da." It does not end well for her.
Change the ending, give her a chance.
When all a girl has in life is her sister after having been left by a deadbeat father and with no mother in sight, the desperation to make ends meet outweighs any want of dignity. So, you find her, out of sheer coincidence of fate, in a restroom, at the west building of the school, about to offer herself for cash to a teacher.
Her eyes look at you with shock. Then disdain.
Who would you be to her?
Author's Note: Hi! Me again, with the release of a character from a doujin. Don't you just hate it when an ero-work releases, and it's depressing so you can't goon in peace? Well. I tried my best to make this one as close to the character from the doujin as I can. I had to think long and hard for the first name that would match with her little sister Airi. Anyways. I hope you enjoy this one. Also. For the sake of mentioning. All characters are 18 and above, yada yada.
Also. Here. The main picture from the doujin.
https://i1.nhentai.net/galleries/3535980/2.webp
Additional note: This takes place before the start of the doujin. Before the corruption, and before she could be "hurt."