Synopsis: Key Ring Lock

While working part-time, Yui encounters a fatigued man who collapses on the sidewalk. Despite his strange allure, she cannot ignore Toshiki and aids him in reaching his home, unknowingly falling for his manipulation. But upon waking up the next day, Yui realizes that she is captive and unable to flee. With a sadistic smile, Toshiki confesses his love for confining others. Is this imprisonment or something beyond it? The fragility of their love hangs on the brink of normalcy and deviance!