Overview

Karen, my girlfriend's younger sister, who I miss. At first, I even thought it was annoying... My feelings changed after I started to suspect that the person she was traveling with was a man. I confused my feelings of anxiety towards her with your sister... I'd rather cheat on you than be cheated on... That's how I felt, but... His behavior toward Karen, who accepts everything, escalates. Cheating, betrayal, and sex are no longer enough; blindfolding, shackling, training, and...