Ep. 1: Seiji Sawamura encounters mysterious young girl Midori Kasugano in Japan

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The narrative introduces Seiji Sawamura, a man residing in Japan. His life is interrupted by the sudden appearance of Midori Kasugano, described as a mysterious and cute little girl. This encounter marks the beginning of their interaction within the setting of Japan, establishing the initial connection between the adult male protagonist and the enigmatic child who enters his world unexpectedly.