Mezame No Mori

From Fantasyshrine:
Yoshimori, a rookie editor, first met the wheel-chaired writer, Orito, and his brother, Masato, at the publishing company’s party. Masato’s sad smile left a deep impression on Yoshimori. Later, due to work, Yoshimori had to stay with the brothers in their secluded home and discovered the shocking truth about their relationship.