Kenji, the second son of three brothers, had always been seen by his mother Aoi as a low-maintenance child. However, one spring, his older brother moved out for work, his younger brother enrolled in a boarding school, and his father began living separately due to a job transfer. Suddenly, the house grew quiet. With only the two of them left, Kenji and Aoi began living together alone. The once-bustling household fell into stillness, and Aoi began to feel loneliness creeping in. Noticing her sadness, Kenji started directing toward his mother the affection he never received from his siblings, and a desire to possess her completely began to awaken within him.