Mari had taken refuge with Kurahara, the man who once saved her son, Atsushi. However, Kurahara, who harbored feelings for Mari, forcefully made advances toward her. Out of a sense of obligation, Mari couldn't refuse and ultimately gave in to him. When Atsushi discovered their relationship, wishing only for his mother's happiness, he left home. Upon returning after a long absence, Atsushi was horrified to find his mother bound naked, treated like a sex slave. He stood frozen in shock at the scene before him.