Ren Yamai is a student at Itan Private High School, and one of the main supporting characters in Komi Can't Communicate. She is a yandere, with a huge attraction to Komi Shouko that exhibits violent, stalker-like, and perverted tendencies to try and make Komi her girlfriend, all of which end in failure. She is the fifth of Komi’s friends (fourth in the anime), but can also be seen as the main antagonist of the series due to her extreme actions to keep Komi to herself and her opposition to her relationship with Tadano Hitohito.