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The protagonist Junwa has a younger sister named Izumi, and he was an extremely ordinary high school student when he first entered school. However, in the past, he was involved in an accident that led to his parents' death, and Junwa himself lost his memories from that time. Surviving the tragedy, Junwa was taken care of by relatives and continued to live a life for two with Izumi, his only remaining family. And now... starting to attend the same high school as Izumi, the place allows both of them to forget the past and find happiness. A new life, environment, and first encounters. For Junwa, who originally lived in a world that only included his sister, life in this town feels exceptionally fresh. However, soon after Junwa begins to recover the memories he lost in the accident, amidst a happy and joyful life, he finds himself wavering between the past, present, and future... The truth concealed by Junwa's memories is...