Rororro!

Akita Shoten
Sakurai Norio
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  Chitose Morishige is a 12-year-old seventh-grader without a friend in the world. Her father, Professor Morishige, built a robot companion for his daughter to ease her loneliness.

  The only problem is that Ichika Robata, the android, is so lifelike that Chitose believes she's a normal human girl who either ran away or was kidnapped by her father. Ichika attempts repeatedly to prove that she's a real robot, with hilariously disastrous results.