Mother Risa Misaki was looking forward to welcoming her eldest son home for the first time in a while, but at the same time, she was deeply troubled by her younger son who had been shut away in the house. While her joy at her eldest son's return appeared calm and genuine, behind the scenes a secret incident involving her younger son was unfolding. Risa desperately wanted to hide this from her eldest son, but one day he catches her in the act, leading to an unexpected turn of events. A story of family bonds and emotional conflict intertwines with taboo desires, humiliation, and hidden vibrator-fueled secrets coming to light.