Mayu is a 29-year-old divorced mother who sells love within a birdcage of 150 meters. She works as a sex worker who avoids penetrative acts, earning money only through non-penetrative relationships with men. Her brief happy marriage ended when her young son fell ill, derailing her life completely. Every day she wears herself down physically and mentally, but she endures it all for the sake of her only family, her son. She clings to the hope that one day she will be able to escape the cage of 150 meters and fly free. However, cruel and sordid realities repeatedly assault her, forcing her to fight desperately just to survive. The story follows Mayu's struggle as she navigates the brutal world of sex work, facing exploitative clients, the stigma of her profession, and the constant pressure to provide for her child. Her journey is one of survival, resilience, and the search for a way out of the cage she has been trapped in. The narrative arcs center on her daily battles, her relationships with clients and coworkers, and the harsh consequences of the choices she has made.