[DeepL Translation - needs review] Volume 1 Introduction: Younger sister Iku and older brother Yori. They used to be very close twins when they were little, but now, at the age of 15, Yori, who can do anything, and Iku, who can't do anything, are not much alike. But now, at the age of 15, Rai, who can do anything, and Iku, who can't do anything at all, are not alike! He says that she has been the most important girl in his life since he was a child, and he presses her to kiss him first if sh...
