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The story focuses on a cold and distant 17-year-old girl, Nanaka Kirisato, who only cares about studying to get good grades in school and being accepted into a good college. Nenji, her childhood friend, doesn't really care about school and will often get into fights. Soon, Nanaka has an accident that causes her mind and memories to be reverted back to the time when she was 6 years old. Nenji ends up becoming the 6-year-old Nanaka's babysitter until they can find a way to turn her back into the 17-year-old Nanaka, which causes trouble and comedic situations.
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Episode 1
Nanaka Kirisato was a person who refused to have fun, preferring to study. Then one day after a fight with her best friend, she falls down a flight of stairs. When she wakes up in she has mentally regressed to the age of six.





