Gikei no Senaka

"I'm in love with my sister's husband." In this world, there are some people you're just not supposed to fall for. Yuuki lives with his sister and her husband, and for years has harboured a forbidden passion for his brother-in-law. Keiichirou never seems to pay any attention to him other than what's to be expected, but once his wife passes away, he insists that Yuuki continue to live with him in their house. Will the delicate balance of their relationship finally begin to crumble?