One night and two days of 1 night and left alone by my wife's sister who suddenly came over

Noboru crosses the line with his sister-in-law Rin. The trigger was my wife's runaway. The couple started a fight, and while they were alone in a lonely drinking evening, Rin suddenly came to visit. He said he came to help Noboru, who is troubled by unfamiliar housework. As a result of believing those words, they fall into a trap. When Noboru learns that Rin's true purpose is to clear his frustration, he mobilizes all his reason and runs away, but Rin's tenacious temptation begins to disappoint him...