Iku Suto is Rentaro's 9th girlfriend from 100 Girlfriends franchise. She loves baseball, to the point of spending hours recruiting for her team when it's on the verge of being disbanded. She is determined to do her best no matter what; because of this she's described as the embodiment of "stoicism" by Rentarou. Iku is also wildly masochistic, going so far as to train for hours until her body is in agony so she can enjoy the pain.
Despite being a masochist, she has a high tolerance for pain. Iku is capable of training for hours on end, even going so far as to train all night long until school begins the next day. She's able to do over 101,000 times bat swings without collapsing, for better or for worse, though this may be due of her love of pain.
