Noboru crosses the line with his sister-in-law Rin. - The trigger was my wife running away from home. - The couple had a quarrel, and Rin suddenly came to visit him while he was having a lonely evening drink. - It is said that she came to help Noboru who is having trouble with household chores that he is not used to. - As a result of believing those words...I ended up falling into the trap. - When Noboru learns that Rin's true purpose is to take out his frustration, he uses all his reason to run away, but his reason begins to give way to Rin's persistent temptations...