The song 'CHIHIRO' by Billie Eilish explores themes of love, loss, and uncertainty in relationships. The lyrics depict a sense of longing, confusion, and a desire for connection, symbolized by the metaphor of opening a door to understanding and emotional vulnerability. The protagonist grapples with feelings of abandonment and questions the sincerity of past interactions, reflecting on the complexities of human emotions and the unpredictability of relationships.