Hime Chan's Ribbon

What? I Can’t Change Back! (1x17)

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Hikaru was at a hamburger store wondering why Hime-chan didn't transform. She was with some of the other girls of the Daichi fan club. One of the other girls had a science fiction book. The title was "parallel world", and when Hikaru saw it, she realized what the magic word for Hime-chan's transformation was. She decides to set a trap for her with the help of a magazine photographer.