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Aira, a 16-year-old witch in training, has a charismatic boyfriend named Shinjo. One day, he confides in her about his mysterious past; he can't recall anything from his childhood. Intrigued, Aira uses her family's secret time-doors to journey into the past and discovers that Shinjo is actually her childhood friend, Kairi! She is distressed when she returns to the present and sees Shinjo transforming into Kairi. He no longer remembers being 'Shinjo,' but he still cherishes memories of his childhood with Aira. What will Aira do?
Meanwhile, a malevolent comet from space is hurtling towards Earth. Will Aira continue to mourn the 'loss' of her boyfriend, or will they unite to combat the impending threat and save the world?
