Jun is described in episode 4 of the second season as "Genius Storyteller. There is no story he can't tell. Good-looking guy". His stories usually drive other characters to tears even though some of his stories have a mocking purpose. He has previously checked out every book in the library Nozomu wants to read, and lives with his grandfather (a reference to Seiji Amasawa in Whisper of the Heart).

His name comes from the bookstore "Junkudo-Shoten" and Jun Kudou, its founder.