Kind-hearted and gentle mother Chisato (50) has been secretly worried for nearly ten years about her son Masaki (28), who has lived a reclusive life confined to his room. Driven by maternal responsibility and love, she prays daily for his independence, offering him warm, tender encouragement. Once again today, she softly reassures him: "Don't worry, Masaki... everything will be alright... you'll surely find a good job soon..." trying to gently comfort his fragile heart. However, her loving kindness triggers an unexpected turn of events. Without anyone in the family realizing it, a shocking descent into forbidden incest begins to unfold. Beneath it all, a dramatic tale entwines family bonds and profound loneliness, drawing the audience into its emotional depths.