No.9

A young girl named Nae is ostracized by her peers for constantly talking to herself, though she insists she's speaking with an invisible companion that only she can see. When a family tragedy occurs, Nae's unusual behavior escalates, drawing concern from those around her. This leads to the arrival of Hiromasa "Nine" Tsukumo, a peculiar specialist who arrives to evaluate Nae's situation. Nine, who has his own mysterious invisible companion, recognizes something extraordinary about Nae's circumstances. As he begins to guide her understanding of these unseen entities, their unique connection opens the door to a hidden world that exists parallel to our own.