Jun is the youngest child of a family with two boys and three girls. Because she was the youngest of a relatively large family, her father was a salary-man and she was often picked on by both her siblings and her peers, she then started to gain an independent, cocky and self-assured personality. She often told herself, "The idiots are just jealous because I'm a genius." Jun began smoking, attending nightclubs and having sex at a young age since it made her feel more like an artist and gave her a sense of self-worth. Even though some of the activities she engaged in would be considered degrading by most, she feels that as long as doing those activities gives her that sense of self-worth she will continue to do them. Like Nene, she has difficulty trusting people, but unlike Nene, this includes both men and women because she never really had anyone to confide in. Jun will continue to do whatever it takes to maintain the image of what she sees an artist should be.
Jun is very independent and self-assured, meaning that she has much less doubt than Nene. However, due to her fear of ridicule and failure, she's very nit-picky and will agonize over even the smallest of details. She has university classes as well, but she doesn't really attend them due to both her lack of interest in attending and the fact that she is a late sleeper. She spends most of her time either hanging out with Nene, other friends or visiting clubs. Jun is relatively thin because she smokes, drinks coffee regularly and doesn't eat properly (she doesn't care what she eats as long as it fills her up and she has a penchant for junk food). She admires Nene due to her passion about making clothes and the fact that she can take her greatest shortcomings, use them as her greatest asset and come off as an optimist at the same time.
Jun's feelings about sex are also relatively straightforward. While she enjoys the pleasure it brings and the mood it sets, she enjoys the fact that she can have the control of making someone else feel good even more. Her first sexual encounter also made her feel more like an artist than anything else had up to that point.