Tsukasa Kirishima is a freshman in college. He lost his parents in high school, and in his second year of high school, he once saved a very beautiful girl from being attacked by a pervert near his house. He sometimes thinks about it, but when a male friend who goes to the same university invites him to a blind date, he goes and finds the super beautiful girl he saved that time! That day, he starts to get involved with a super beautiful girl. He also gets involved with her sister…… As he gets to know the beautiful sisters, Tsukasa Kirishima is gradually swallowed up by them, feeling a great sense of “discomfort.”