Jun'ichi and his friends have been invited to vacation on a private island during the summer. But while everyone expects pure-hearted fun in the sun, Mitsuki has other plans! Now the Geno Killer is in for a ride as Mitsuki's sunblock aphrodisiac gets all the girls ready for action. Jun'ichi must struggle to keep his pants on, lest the desires of the women around him become too much to bear!
What do you do when you live together with gorgeous twin sisters who are intent on seducing you? This is the daily dilemma that faces Keita Suminoe, and politely declining their offers doesn’t seem to be helping him! Despite his school friends' jealous quips, and parents who think everything is fine as the siblings are not blood-related, this makes no difference to the brow-beaten boy. Unfortunately for Keita, school entrance exams are just around the corner, and scantily-clad girls sneaking into his bedroom at night is starting to affect his chances of graduation. Can he focus his mind in time, or will breasts, panties and milky-white thighs prove to be too much of a distraction?