Shiina Mika

A young schoolgirl her father recently remarried. While her father is enjoying himself overseas with his new bride she lives alone with her younger brother Toshihiko. The robot mistakes her for her new step-mother Etsuko. She thinks it would be fun playing with the robot so she pretends to be Etsuko and claims that her brother is her new husband Tadashi.

When she finds out it's purpose is to make sure couples become pregnant she thinks she can trick it . . .