Mezame no Mori

From Fantasyshrine:

Ch. 1 & 2: 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. What’s the secret hidden behind the award-winning novel, “The Sealed Memories”?

Following summaries by HoshiSama

Ch. 3: The Loose Shackle: Aki and Ren have been best friends since middle school. Aki is now engaged to Takako and they have already picked the wedding date. What will happen when Ren makes a startling confession? And how will Aki react to being confronted with his past when he sees his childhood bully, Shimizu?

Ch. 4: Together Until Dawn & Ch. 5 (Omake) Together into the Night: Robert, a playboy heir set to inherit his father's company suddenly enters into a physical relationship with the family servant, Yuri. What spurred this decision and what will unfold between these two? Will they be able to find love?