Aoi, a cabaret hostess, and Airi, a university student, are unrelated sisters. They have a secret that they cannot tell anyone else. Their relationship is more than just that of sisters. One day, Aoi is involved in an accident, and although she barely manages to survive, she falls into a coma and is in critical condition. Airi , who continues to watch over her sister, begins a relationship with Serina, Aoi's junior who Serina Airi . Three years later, Aoi finally wakes up. However, she has lost all of her memories. Then, a beautiful therapist named Yuria appears to treat her memory loss... Intertwined fingertips, overlapping lips, bodies that desire each other. The intentions of four women, where jealousy and desire intertwine in a complex way...