Yui started working at her father's company, where she was well-liked by senior colleagues and enjoying a fulfilling life as a working adult. Noticing her presence, company president Sugaura promoted her to be his personal secretary and gradually began pursuing a lewd relationship with her. Though Yui resists, Sugaura threatens her father's position at work, emotionally manipulating her. Bringing up the fact that her father raised her alone after her mother's death, he preys on her guilt and loyalty until she is ultimately forced into submission. As her professional and private lives become entangled, her life takes a drastic and devastating turn.