A lonely type with a big heart and an uncanny ability to read people. From Hydra when he first enters adulthood to Rules where he's working a steady job, you see his loves, his losses and all the friends he's held dear to him over the years. At the beginning of Rules, he is 26 years old, and works in stage setting. Hikaru is a young bisexual man that became acquainted with Yukio Konoe in a gay cruising area. He has an open and frank personality, and he's good at taking care of others. He adores Konoe, and acts as the boy's psychological pillar. His first main appearance is in the Hydra series.