After a long time, when I returned home, my sister "Ai" who had been in good company since ancient times welcomed me well. that night, my brother and i... Can I sleep...?" he went into the futon. When he was confused, he said, "...I like my brother. But I know that's not good, but ... I can't hold back this feeling." My older brother, who was confused by how he grew up from child to girl but had the same feelings with each other, couldn't help but connect with his younger sister.