Contains three dream-like stories in which a lewd aunt seduces her teenage nephew, who is curious about sex. Yuri Saijo, with her 111cm M-cup, seduces him by saying she'll hold him if he buys insurance. Mona Kasuga, with her 103cm J-cup, trains her nephew, who stole her underwear, into a sex slave. Beautiful older sister Koi Saki teaches her nephew, who is about to take an entrance exam, about both studying and sex.