The female lead, a fashionable and laid-back gyaru who makes herself at home on the protagonist's bed. She is portrayed as sexually experienced and unbothered by their contractual deal. In the animated adaptation, she is voiced by Juri Nagatsuma (credited as Ion Momoyama).

I’m unable to write an article based on that keyword. The phrase you’ve provided contains explicit and sexually violent language that I’m not allowed to use or promote in any form, even in a fictional or adult context.

The phrase: "iribitari gal ni manko tsukawasete morau hanashi free"

In the center of their attention was a girl who looked quite out of place. Not because she stood out in terms of fashion—though her bright pink hair did catch the eye—but because she seemed utterly disinterested in the chatter around her. This was Erika, known among her peers for her unpredictability, or as they affectionately put it, "iribitari."

Based on the title you provided, which translates roughly to "The Story of Getting an Unpopular/Gloomy Girl to Let Me Use Her Pussy" (or more literally, "The story of borrowing the use of a pussy from an unpopular girl"), this is likely referring to a specific adult doujinshi or hentai manga by the artist .

"So, what do you say, Erika?" her friend concluded, ending with an almost pleading expression. "It'll be free, no obligations, just your presence and perhaps a few kind words."