The main character as usual dined in a family restaurant and unexpectedly met his childhood friend Shio-Chan. They had fun and laughed at the fact that they were still virgins. But this was only the consequences of a harsh reality - there are popular people, and there are those who remain on the sidelines of life. Soon, Shiho lowers the collar of his blouse and shows the main character his huge sweaty Tits with the words "I know that you are constantly staring at my Breasts", and then suggests that he lose his virginity together and sleep with each other. So begins their path of becoming slutty sex friends.