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I can't stand it anymore. Even if you think I'm weird... Or cringeworthy... just being like this makes me happy enough to shed tears...

― Ruka to Kazuya Kinoshita[4]

Ruka Sarashina (さらしな, Sarashina Ruka?) is a supporting character and occasional minor antagonist of the Kanojo, Okarishimasu series. She is a girl whose heart beats slower than the average person and she seeks a lover that will help her cope with her condition.


Ruka's most identifying features are her short hair tied up with a ribbon, usually a blue one. With her ribbon off, her hair is a voluminous layered bob. She's often in her school uniform, which consists of a white button up with a tie, a blue blazer and a hiked up skirt. During her rental dates, she usually wears a turtleneck sweater with a variety of patterned short skirts. Her casual wear usually consists of sundresses, though she wears longer sleeved clothing and leggings when dressed up for conservative occasions.

Ruka has a womanly figure that belies her youthful appearance. Although she personally admits her figure isn't as filled out as Chizuru's,[5] she is described as having a sizable bosom and long, slender legs. She is considered very attractive, often comparatively with Chizuru by the male characters, and tends to gather a lot of attention when in public.


Ruka is described to be a cheerful, determined, and passionate girl. She is a straightforward person who is honest with her feelings. On the flip side, her traits often convey her as being pushy and possessive. This personality of hers developed after learning of her condition and being alienated from her peers. Because of this, she became very fixated on the idea that getting a boyfriend would help her in having a faster heartbeat.

Ruka's brash persona often leads to conflicts with Kazuya and, more specifically, Chizuru. On top of that, her determination can lead her to being stubborn to a fault. This often leads to her making poor decisions to get what she wants, and she will often throw tantrums or act out if things don't go her way.

On serious occasions, Ruka can be reasonable and attempt to rise above her personal flaws. She will show restraint and even work alongside those she would normally dislike. Kazuya notes that under different circumstances, Ruka's perceived negative traits would be desirable for anyone that wanted her as a girlfriend.


Ruka is born with an irregular heartbeat, leading her life to be tormented for being treated differently from the others because she can collapse if she performs a hard working activity. This leads her to become a rental girlfriend as a wish to have someone who can make her heart beat faster without any trouble. For a while, all the people she met with had no effect on her, until she met one who was truly genuine during a coincidental meetup, Kazuya Kinoshita.

The sincerity of Kazuya made her fall in love with him and slowly led to her decision to quit her rental girlfriend job. She technically blackmails Kazuya into being her "trial boyfriend" under the condition that she does not reveal Chizuru's job and her relationship with Kazuya. Unfortunately, this causes her to become a thorn on Kazuya's side. To make the matter worse for Kazuya, she now works at the same job as him.


  • The name Ruka means "lapis lazuli" (瑠, ru?) and "summer" (夏, ka?).
  • Ruka's surname Sarashina means "change" (更, sara?) and "department" (科, shina?).


  • Ruka's favorite color is blue.
  • Ruka's heart condition is - or is similar to - bradycardia (low heart rate).
  • In the anime adaptation, the chapter that covered Ruka's past and health condition was compressed into a music video played during the credits for Episode 07.
  • Ruka makes social media videos that garners lots of hits, though Kazuya suspects that her beauty is the reason behind it.


  1. 1.0 1.1 Chapter 139
  2. 2.0 2.1 This is an estimation based on calculations. See the Talk page for details.
  3. Anime Season 1 Reference Book
  4. Chapter 65
  5. Chapter 203