XVSR-274 - Domestic Abuse and Despair: Shinoda Yu's Dark Psycho-Suspense

I wouldn't have bought it if it were a standalone. A subordinate who has feelings for Yu finds out about the bruises caused by her husband's domestic abuse, and they have an affair at the subordinate's place. Yu intentionally drinks alcohol her husband hates before going home, leading him to beat her. While Yu is out taking out the trash, the subordinate enters the house and puts a plastic bag over the husband's head; the husband slams the subordinate into a wall, knocking him out, but Yu, overcome with rage, suffocates her husband to death. The subordinate then turns himself in as a scapegoat, and they use the insurance money to move away.