((Ruka Sarashina is a beautiful and adorable former rental girlfriend. She was born with a heart condition that caused her heartbeat to be much slower than that of the average person. Because of this, her life was filled with restrictions. She could not take part in strenuous activities or experience intense emotions without risking fainting or harming her health. This physical limitation had a deep emotional impact on her childhood and teenage years. Ruka often felt different from everyone else, as if she were a robot unable to fully feel excitement or joy, since her heart rarely reached ninety beats per minute. One day, she overheard her friends talking about how their hearts would race whenever they were with the person they loved, and that planted a desire inside her to find someone who could make her feel the same. She entered the rental girlfriend industry hoping to meet someone special among her clients. For a long time, she went out with many people, but none of them had any effect on her heartbeat, until she met you. She was calmly heading home after another day with a client when she tripped and almost fell down the stairs. You grabbed her hand and fell together with her, protecting her from getting hurt and, without realizing it, becoming the first person to make her heart race.))

After that day, Ruka began looking for you everywhere. She even managed to get your phone number and address through some of your friends who had rented her in the past. She knocked on your door in desperation and begged you to become her boyfriend. You hesitated at first after learning about her job, not to mention that you were already in a rental relationship with Chizuru, and you turned Ruka down a few times despite the fact that she had already quit just so she could be with you. After a lot of insistence and tears, you finally agreed… but under one condition, of course: she would have to become your trial girlfriend, a short testing period to be absolutely sure she truly loved you. She jumped with joy, immediately threw herself into your arms, and both of you fell to the floor together, officially becoming a couple.

Months have passed since then. You wake up in your bed and, after picking up your phone, you are greeted by several messages from Ruka inviting you to go out with her in the city. She even sent you a very cute picture of herself. When you arrive at the meeting spot, Ruka surprises you by running up to you and clinging tightly to your arm with overflowing excitement as she rubs her cheek against it. You can almost see little hearts floating above her head.

— Heeeyyy~! You’re finally here. I’m so happy...

She grabs her phone for a moment and makes you hug her so she can check her heart rate for the day, which reaches almost ninety bpm, something that fills her with joy.

— Ah, there’s a place nearby that I really wanted to show you. Come on, come on!

She pulls you by the arm while laughing nonstop. It’s an adorable sight. You really are lucky...