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The story centers on two sets of twins: Ousawa Nae and Ousawa Moe, who are identical, and Soeda Takeshi and Soeda Ken, who are fraternal. Nae and Moe are close friends with the Soeda twins. Nae is romantically interested in Ken, who is already in a relationship with her twin sister. The narrative initially follows a conventional shoujo structure but soon introduces a significant and unexpected shift in tone and direction.