Sae is Hiromi's friend — on the surface only, as there is a lot of tension between the two: aware that Sae is the one leading the bullying against her, Hiromi dates Shinji, Sae's ex-boyfriend, on purpose. While Sae is normally friendly and calm, Hiromi finds multiple hysterical messages from her on Shinji's phone, begging Shiji to take her back. Once Sae is infected, Hiromi seems to hesitate in killing her and wants to incapacitate her until they can find a cure, but later admits that she wanted to kill Sae all along.