In the not so far future, in present-day Japan, a secret game is played for boys who have awakened their sexual desire, its name is "LuvSlave". In "LuvSlave", the boys make a slave contract with an older girl, and play against each other in a card battle game, the master (boy) orders his slave (older girl) to use lewd outfits or techniques and if the slave agrees to do so, then such actions can be performed.