Ruka Sarashina

A girl characterized by her short hair and ribbon. Her birthday is August 26th. She is petite at 153 cm but has a voluptuous figure. She is from Tokyo. She appeared as Kuribayashi's girlfriend, but in reality, she is a rental girlfriend affiliated with the rental girlfriend agency Maple. Her name as a rental girlfriend is Ruka Sarashina (same pronunciation).

She suffers from congenital bradycardia, with a heart rate of around 60 beats per minute, which is lower than average. As a result, during her childhood, she experienced dizziness and shortness of breath from intense exercise or excitement. Because she cannot easily get excited, she became concerned about not experiencing thrills like others and thought that perhaps "love" could make her heart race, which led her to start working as a rental girlfriend.

Initially, she thought that people who rented girlfriends were all frivolous, but she found the "thrilling presence" she was seeking in Kazuya, who treated Chizuru, a rental girlfriend, with care. She then showed up in front of Kazuya's house and became his temporary girlfriend under certain conditions. Although she repeatedly makes forceful advances on Kazuya, she is internally aware that she is causing him trouble.

She wants to be Kazuya's real girlfriend more than anyone else, and during the New Year's visit to the shrine, she approached Kazuya's grandmother, Nagomi, and declared herself as Kazuya's girlfriend in front of Chizuru. Kazuya, who had already introduced Chizuru as his girlfriend, explained to others that Ruka had a tendency to lie. She unilaterally views Chizuru, who is treated as Kazuya's real girlfriend by his family despite being a rental girlfriend, as a rival. However, she forcefully kissed Kazuya before Chizuru did and told him it was her first kiss.

She coerces Kazuya into a trial relationship, but even after Kazuya, unable to suppress his feelings for Chizuru Mizuhara, breaks up with her, she refuses to end the relationship and continues it forcefully. Like Mami, she does not hesitate to use any means to achieve her goals, often causing trouble.