He is a friend from Ichitakas class. He is first introduced in Volume 4 during a school trip to Kyoto when he is paired with Iori. At first he appears to be a threat to Ichitaka for he seems to be in love with Iori but eventually it turns out that he is a homosexual and is in love with Higemisensei their teacher. Because Higemisensei is paired with Ichitaka Koshinae requests for a trade bringing the happy Ichitaka back to his crush. From that point on Jun becomes one of Ichitakas best friends and an important listener when he isnt comforted with the advices he got from Teratani. Though he hates physical aggression he is a very adept martial artist when need be.