A young genius doctor and clinic director who treats Youko's nightmares. He diagnoses her with a severe mental disorder and prescribes brain surgery as the definitive treatment, playing a crucial role in driving the narrative's central conflict.
Sakurako directly challenges Katayama regarding the validity and necessity of Youko's treatment.
Romantic partners where Katayama serves as both lover and attending physician.
Explore the full interactive character relationship map of Lucky Sky Diamond