One rainy day, a schoolgirl named Lori finds a cute little girl named Kolulu, who is crying. Lori asks Kolulu where her parents are but Kolulu doesn't answer so she invites Kolulu back to her house and they eat dinner together. Lori treats Kolulu as the younger sister she never had, and she has never felt so happy in her life. One morning, Kiyo tries to get Zatch to go play in the park while he goes to school. Zatch is playing with Vulcan, and he meets Kolulu, he has no memory of her from the mamodo world but she remembers him. Lori comes to get Kolulu and Zatch watches in surprise at how happy they are going home together. At home, Lori notices a glowing pink book in Kolulu's bag. Lori flips through the pages, one page has an intriguing line that is legible, and so she reads it aloud. And suddenly
Kolulu's expression starts to change. Her face is full of anguish! Claw-like fingernails spring from her fingertips, her hair turns steel-like, and her whole body transforms into a mamodo creature in steel armor! The transformed Kolulu shatters the window and jumps outside. Kolulu has no memory of her usual self anymore; she's just an aggressive mamodo! Lori wants her nice, sweet little Kolulu back. She invokes the spell again, and Kolulu returns to her usual self. Lori decides to keep the ugly truth from Kolulu. The next day, Lori and Kolulu are at the park. Lori mistakenly throws the ball really hard and it goes flying over Kolulu's head. Kolulu goes running into the street to fetch the ball, and she doesn't see that a truck is approaching! To save Kolulu, Lori grabs the spell book and reads the spell! Kolulu transforms, and her sharp steel nails pierce the truck whose driver is trying frantically to apply his brakes. From nearby, Zatch and Kiyo hear the sound of the violent collision and a scream, and sensing something they come running to the scene. There they find before them a steel-armored mamodo with claw-like fingernails. It's Kolulu
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