Noboru Koyama is a supporting character in the anime film Hakubo, also released under the English title Twilight. He is a member of the Koyama family and appears in the story as a relative of the main protagonist, Sachi Koyama. He has black hair and brown eyes. His role in the narrative is that of a supporting figure within Sachi's family circle, contributing to the domestic environment that forms part of the backdrop to her personal journey. The film is set in Iwaki, Fukushima, and follows the daily life of Sachi, a high school violinist, as she navigates her relationships and her own emotional landscape in the aftermath of the 2011 Tohoku earthquake and tsunami. As a family member, Noboru Koyama is part of the household context that shapes Sachi's experiences and interactions, though detailed information about his individual personality, specific motivations, personal development, or unique abilities is not extensively documented in widely available sources.