After graduating from university, Yura gets a job at a company and ends up having so much fun going to a drinking party that she misses the last train. - I happened to know that my sister's house was nearby, so I called her and asked her to stay the night. - However...my sister and her husband are both working and seem to be busy lately, so they haven't had sex. - The husband is in a state of frustration... and is lustful at Yura's defenseless appearance. - Without asking any questions, I attacked my wife so that she wouldn't find out...