Kojima Mina: Koe o morashi kanjite (2003)

Since graduating from high school, Anri has been drifting through life without any particular purpose. Her family is wealthy, so she lacks for nothing materially, yet because everyone leads their own independent lives, they rarely see one another. She has a boyfriend named Takeo, but she has never been able to bring herself to sleep with him. One day, Anri is approached by a talent scout named Ida in the city center. However, while they are talking at a coffee shop, a waitress named Mizuho confronts Ida; he had previously deceived her and tried to trick her into appearing in an underground adult video. This incident sparks a friendship between the two women, and Anri comes to look up to Mizuho like an older sister...