ROE-404 After all the family members have left the nest, spending incestuous days with mother at the old family home... Kiyose Aoi.

Kenji was born as the second son of three brothers. To his mother, Aoi, he seemed like a child who didn't require much attention... But one spring, his older brother got a job and started living alone, his younger brother enrolled in a boarding school, and his father went on a business trip alone. Life changed rapidly, and Kenji and Aoi began living together as a mother-son duo. The once bustling home suddenly fell silent, and Aoi felt a sense of loss… Seeing his mother like this, Kenji felt regret and emptiness about her attention only on his siblings, trying to monopolize his mother's affection.