井上 純

Jun is a second-year student at Ryuumonbuchi High School. She is quite popular among girls, while other team members often tease her male-like traits. Hajime states that Jun is like the father of their family.

Jun is also incredibly lazy. Somewhat of a pessimist, she is cynical and snide though still has a noticeable sense of humor. She is also somewhat analytical, as she was able to tell that Saki Miyanaga wasn't yet dead, and still putting up a fight against Koromo.

Jun has a heightened sense of the flow on the board, allowing her to change things into her favor including, but not limited to disabling the tiles her opponents collect.