Mayu Suzumoto calls Jun on her phone to get an update on the state of their production. He informs Mayu that the lead role is still not cast, and suggests that she convince her friend Sakutaro Morishige to audition for the role when she sees him next.
Significant plot details end here.
Jun Arai was planned to be a major character in a cancelled fangame with the working title "Corpse Party D2: The Dragon Mask". His appearance in Depths of Despair was intended as a teaser for that game. He has been confirmed as a major character in the new fan project by the same name.