After losing their parents in a tragic incident, Ryou and his elder brother, Masaya, find themselves under the care of the Takatou household. Ryou, who once shared a close bond with Takatou Akihito, the heir of the family, faces a drastic change in status when a dark truth emerges, putting Masaya's life in jeopardy. Transformed from a trusted companion to Akihito's subordinate, Ryou must navigate treacherous waters to protect both his brother and himself from the very family that has nurtured them for years.