Reiko is a branch manager at an insurance company, busy with work every day. She thought she was balancing her job and family life, but in reality, the distance between her and her husband kept growing. Again today, buried in overtime, she talks to her husband on the phone in the emergency stairwell. Her subordinate, Sugaura, watches her and senses the loneliness and innocence hidden deep within her heart, eventually moving to embrace her. Reiko cannot bring herself to resist Sugaura's advances. Soon, she begins receiving calls from him during work hours. With a mix of anticipation and inner turmoil, Reiko once again walks toward the emergency stairwell, searching for answers within herself.