@Shirokamisama if you're talking about Sayu, she was pretty clear from the start that she accepted to have sex with the guys she lived with because that was the only reason they let her stay.
The only time (up to this chapter) that she said otherwise was in a joke page made by the translators, not in the actual plot.
Edit: Also, gyaru girl really is dumb. Guy just admitted he doesn't care about going out with several girls, even took a runaway home.. and you just tell him "btw, there's a new girl, she's super cute, don't touch her kay?" .... Sure he'll listen, girl, sure he will.