Ruka Sarashina  

, 更科 瑠夏

Ruka was born with an irregular heartbeat and yearned for excitement to speed up her pulse. in search of love and a faster heart rate, she decided to become a rental girlfriend. while being rented out by shun kuribayashi, she met kazuya kinoshita. her heart raced when she was around him, and she discovered that he genuinely cared about rental girlfriends. she fell deeply in love with him and eventually confessed her feelings. however, as his girlfriend, ruka faced challenges because kazuya and his family favored his other rental girlfriend, chizuru "mizuhara" ichinose. determined to win kazuya's affection, she did everything within her power.