The mother is separated from her husband and lives with her two sons and father. Three slutty sisters with big breasts come to visit the house where they live. The sisters came to Tokyo with the intention of picking up handsome men and having sex with them, but it didn't go well because they only met herd-eating guys. They couldn't calm down and decided to use their brothers, who they had used as sex toys to relieve their pent-up sexual desires...