Sora Aoi

The protagonist of this story. His first name is written as 蒼空 (Soukuu) in kanji. He attends the same high school as his sisters, Aki and Nami. Unlike his sisters, he is good at cooking and housework. His effeminate appearance makes him a perfect candidate for cross-dressing, which he finds himself engaging in involuntarily. He is deeply in love with Aki, and doesn't resist her the second time she tries to have sex with him.