Ruka is born with an irregular heartbeat, so she wants to do exciting activities to make her heart beat faster. She becomes a rental girlfriend in hopes of finding love and a faster heartbeat. While being rented out by Shun Kuribayashi, she meets Kazuya Kinoshita. Her heart beats faster when she's with Kazuya, and she realizes he actually cares about rental girlfriends. She falls in love with him, and confesses her love to him. As his girlfriend, she struggles as she knows him and his family prefer his rental girlfriend Chizuru "Mizuhara" Ichinose. She tries everything she can to make Kazuya fall for her instead. (Source: Kanojo, Okarishimasu Wiki)

The protagonist of the story and a first-year student at Shuei High School. He is very tall and muscular, with a face that easily scares those around him. However, Takeo is also extremely kind and selfless, quickly helping others without a second thought throughout the story. (Source: Ore Monogatari Wikia)