Having married her childhood sweetheart, Riko now finds herself trapped in a relationship that has been soured by infidelity. One day, she runs into her old friend Mr Takaoka, who offers friendship, love, and an unusual escape: he teaches her the trick of living inside her dreams. Now, each night, she sinks into another life: first as a high-ranking courtesan in the 17th century, and then as a ser[Bokinfo].