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While the protagonist is alone at home while his parents are away on a trip, his sister comes home with her girlfriends who are rumored to be super sluts! When the protagonist is upset by his sister's big-breasted friends, his sister tells him, "You can do whatever you want with them!" The protagonist becomes extremely excited as he stares at his sister's slutty friends who keep making dirty jokes, and he mistakenly thinks that "I can have sex with anyone I want," and his delusions and groin grow. In this unbelievable heaven-mode situation, the protagonist's rampage knows no bounds, and he immediately inserts himself into his sister's slutty friends one after the other! A harem fantasy of "I wish something like this could happen" with a series of unexpected lucky lewd acts! [Please note that there may be some disturbances in the image and sound, but this is not a defect in the product itself]