Ep. 1: Keita Ibuki encounters Kuro and Mayu amid mysterious Doppeliner attacks in Tokyo.

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Keita Ibuki, a high school student living alone in Tokyo, receives financial support from his father and daily visits from childhood friend Akane Sano following his mother's death by a Doppeliner. While at a ramen shop, Keita meets Kuro and her dog Punipuni. After Keita buys Kuro ramen, an assailant attacks her to capture her alive, despite Keita's intervention. Later, Keita interacts with his neighbor, a young girl named Mayu. She claims to have met her double, but is immediately struck and killed by a speeding truck. These events highlight the dangers surrounding Doppeliners and the tragic incidents affecting those connected to them in Keita's daily life.