Incestuous Days Spent With Her Mother At Her Parents' House Where All The Family Members Have Left The Nest. Yumi Yasuno

Tatsuya was born as the second of three brothers. To his mother Yumi, he was a quiet child who didn't assert himself... But one spring, his older brother got a job and started living alone, his younger brother entered a dormitory school on a sports scholarship, and his father was transferred away—life changed busily, and the two of them, mother and son, began living alone. The lively house suddenly fell silent, and Yumi felt a sense of loss. Seeing his mother like this, Tatsuya felt an indescribable jealousy and tried to reclaim the motherly love he'd never been able to monopolize...