Hikaru is a sadistic murderer who enjoys watching the life fade from his victims, who are primary up-and-coming actresses, claiming that it makes him "feel the weight of his own life". When he was just 11 years old, he was taken advantage of by a married adult actress, which is most likely what warped him to be the twisted man he is today. However, the fact that he bothered visiting Ai's grave implies that he truly did love her, albeit in his own twisted way.