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When I return to my hometown after a long time, my younger sister, Ai, who has been close to me for a long time, greets me cheerfully. That night, Ai came into the futon saying, "Onii-chan ... together ... can I sleep ...?" When he was confused, he confessed, "... I like my brother, but I know it's not cool. But ... I can't control this feeling." I was confused by how I grew up from a child to a girl, but my brother, who had the same feelings as each other, couldn't control and connected with his sister ...