古灯 純

Jun is Ryoshiko's boyfriend and the childhood friend of of Atsu, Karin, Yume, Yurari and Seiji. Later, he becomes the friend of Mitsu.

He and Ryoshiko know each other from the middle school but they did not talk to each other before. Jun only noticed her in high school during a painting class because he had been hypnotized by her concentration. He had asked her to go out with him soon after.

He is quite cool and friendly, and very much in love with Ryoshiko.

He is among the few students who do not idolize Yoshino-sensei because he already idolizes Ryoshiko.
He is very good advice when Seiji is confused with his feelings.