Having lost his father at an early age, Kazuaki grew up in a household with his mother and grandmother. Developing an unusually close bond with his grandmother—the typical "grandma's boy"—this intimate relationship did not go unnoticed by his mother. Seeking solace in loneliness, the mother began getting heavily drunk every night, eventually causing her relationship with her mother-in-law to deteriorate. Unwilling to lose Kazuaki, the mother plunges into a forbidden affair with him. Torn between his mother and grandmother, Kazuaki's fate takes a dark turn as the twisted web of incest unfolds.