Protagonist Kuon Yukihiko who is plain and not bright who is not popular and lives. To such him, the news of father's death who sent dissipation life at choice comes. And in several days to such Yukihiko who doesn't have time to get depressed either, five girls one after another have come unexpectedly. Moreover, all members are huge breastses!! All the members bust exaggerated 100 centimeters!

When you hear any talk, the situation afterall that the usual damn old man was suitably multiplied the voice by son's fiance and rolled up. Changing completely current non-popular life, Yukihiko who has spent plain life though is puzzled only first, the huge breasts harem life was satisfied before long.