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Iin Chiyo (伊院 知与 Iin Chiyo) is the 12th girlfriend in The 100 Girlfriends Who Really, Really, Really, Really, Really Love You by Nozawa Yukiko. She is also Aijou Rentarou's cousin.


Chiyo is petite with short hair tied into small twintails, along with glasses.


Chiyo is reliable and tidy which led to her becoming class president. But, she secretly dislikes the high expectations others place on her.

When she takes her glasses off, she becomes anxious and begins crying uncontrollably.



  • Iin (伊院) is made of 伊 (Italy, but may also refer to 伊呂波, meaning "fundamentals") and 院 (institution, or school).
  • Chiyo (知与) is made of 知 (wisdom) and 与 (to participate, or award).


  • She is the second girlfriend introduced who is related to someone else within Rentarou's family. The first would be Hahari.



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e100 Kanojo
Media Manga
Story TimelineCharactersChapters and Volumes
Main Characters Aijou RentarouHanazono HakariInda KaraneYoshimoto ShizukaEiai NanoYakuzen KusuriHanazono HahariHaraga KurumiMeido MeiSutou IkuUtsukushisugi MimimiKakure MemeIin ChiyoYamato NadeshikoYasashiki YamameMomi MomijiYakuzen YakuTorotoro KishikaKedarui AashiiNakaji UtoMeido Mai
eList of Girlfriends
#1 to #5 Hanazono HakariInda KaraneYoshimoto ShizukaEiai NanoYakuzen Kusuri
#6 to #10 Hanazono HahariHaraga KurumiMeido MeiSutou IkuUtsukushisugi Mimimi
#11 to #15 Kakure MemeIin ChiyoYamato NadeshikoYasashiki YamameMomi Momiji
#16 to #20 Yakuzen YakuTorotoro KishikaKedarui AashiiNakaji UtoMeido Mai
Other Aijou RentarouAsakawaLove God