Ruka Sarashina is a main character in the Rent-A-Girlfriend manga series. Illustrated by Reiji Miyajima, it has been serialized in Kodansha's Weekly Shonen Magazine and complied into twenty one volumes. Ruka is introduced as Shun Kuribayashi's girlfriend, but she's another rental girlfriend for like Chizuru. Seeing the way Kazuya cares about Chizuru, she wants to date him. She has a condition that results in a low heart rate. She realizes her feelings for Kazuya when her heart rate elevates. Later on, Ruka gets a job at the same karaoke bar as Kazyua.

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