Inoue is a supporting character in the narrative, primarily known for being a close friend of Kenichi Yamamoto and a member of the school's photo club. His role is defined by his loyalty to Yamamoto, as he becomes directly involved in the escalating conflict with the titular character. Along with Yamamoto and two other male students, Inoue participates in a nighttime ambush against Tomie and her friend Reiko Matsuhara. During this violent confrontation, the group manages to cut off one of Tomie's ears, an act that is pivotal to the plot as it directly leads to the revelation of her supernatural regenerative abilities. Beyond this specific act of aggression, his motivations are driven by the collective obsession and madness that Tomie incites within the class, influencing the boys to act on their hostility toward her. No detailed background, personal history, or significant character development is provided for Inoue, and he does not possess any notable abilities outside of his participation in the group attack.