Ren Yamai is one of Komi Shouko's classmates from Class 1-1 Spoilerand her stalker. In her main arc in Volume 2, her obsession with Komi led her to kidnap Hitohito Tadano and threaten to kill him.SpoilerDespite her initial scheme against Hitohito and Shouko's rejection of her advances as a result, Ren learned to tolerate Hitohito and managed to tone down her insanity enough to become one of Shouko's companions. Still, throughout the story, she has attempted various tactics to get into vaguely sexual situations with Komi.