The members that Tomori gathers to make her erotic game are all big breasted girls. One of them was a boy named Mikoshiba. Tomori was so impressed by the erotic illustration on Mikoshiba's sketchbook that she picked it up by chance and decided to make an erotic game that would go down in history. But first, she has to get Mikoshiba's attention before she can start, so she presses him with her proudly erotic body!