Mami Nanami

Her birthday is November 13th. She is 158 cm tall. She is Kazuya's ex-girlfriend. She attends Nerima University, majoring in German. She is a member of the same tennis club as Takeshi Sasano. She has a younger brother and is from Tokyo. She dated Kazuya for a month but broke up with him at the beginning. She didn't have any special feelings for Kazuya, as anyone would have been fine for her. Although she usually has a friendly personality, she has a rather cunning side. She tweets her true feelings on a private account, internally criticizing Kazuya as a "virgin," Chizuru as "that woman," and Ruka as a "mentally unstable girl." She doesn't take kindly to Kazuya making a new girlfriend immediately after breaking up with her, seeing it as a slight against her, and combined with her first impression of Chizuru, she plans to break them up. Initially, she completely looked down on Kazuya, but after witnessing him interacting with other women despite being dumped by her, she develops a dark emotion akin to obsession. Later, she accidentally witnesses Kazuya on a practice date with Sumi, which leads her to investigate Sumi's background and discover that Chizuru is a rental girlfriend. Subsequently, she takes actions behind the scenes, such as posing as a rental girlfriend client to approach Chizuru and contacting Kazuya's grandmother's social media account.