Seventeen-year-old Nanaka Kirisato is a high school student serious about her studies and goals in life. She frequently criticizes her best friend, Nenji Nagihara, for being a childish delinquent who spends his time fighting other boys. Then one day, after a heated argument with Nenji, she falls off a flight of stairs and suffers a brain injury, resulting in her mind reverting to that of a six-year-old. With this in mind, Nanaka's father and Nenji must keep her injury a secret as she struggles to live a normal life and grow up all over again.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Nanaka Kirisato, 6 Years Old! | 2003-01-08 | 25 min |
| Season 1 | Episode 2 | Pianist Nanaka | 2003-01-15 | 25 min |
| Season 1 | Episode 3 | Big Sister Nanaka | 2003-01-22 | 25 min |
| Season 1 | Episode 4 | 3 People With a Good Relationship | 2003-01-29 | 25 min |
| Season 1 | Episode 5 | Nanaka's Triple Date | 2003-02-12 | 25 min |
| Season 1 | Episode 6 | School Excursion Nanaka | 2003-02-12 | 25 min |
| Season 1 | Episode 7 | Continuing Trip Nanaka | 2003-02-19 | 25 min |
| Season 1 | Episode 8 | Nurse Nanaka | 2003-02-26 | 25 min |
| Season 1 | Episode 9 | Nanaka the Distraction | 2003-03-05 | 25 min |
| Season 1 | Episode 10 | Cultural Festival Nanaka | 2003-03-12 | 25 min |
| Season 1 | Episode 11 | From Nanaka to Nanaka | 2003-03-19 | 25 min |
| Season 1 | Episode 12 | Domikaru Nanaka | 2003-03-26 | 25 min |
| Writing | Tomoko Konparu | Series Composition |
| Directing | Hiroaki Sakurai | Series Director |
| Sound | Toshio Masuda | Original Music Composer |
| Visual Effects | Masayuki Onji | Character Designer |
| Camera | Youhei Suzuki | Director of Photography |
| Art | Shichiro Kobayashi | Art Direction |
| Visual Effects | Masayuki Onji | Supervising Animation Director |
