"Big brother, let's do it for the first time in a while?" Though they love each other, the two have lived separately and have never been able to be together due to their relationship as brother and sister. They meet again after time has passed, and remembering the passion of those times, the sister wishes her brother could desire her once more. The brother wishes he could embrace his sister with her soft, warm breasts once more. Is it because they are blood relatives that they are fired up? This is a story of incest that certainly existed in this world.