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Kay comes to Oceanic School Androud that is also a large ocean city. Kay saves Kisaragi Miyu, who lost her memory three years ago. Since then, she secretly sigh at him. Her twin sister, Yumi, MIA helps bring her love, but her thought oscillates between Keey and her sister. They lost their parents and lived helping each other. However, one day, Yumi turns out to be an Android, which made his parents...