Ep. 1: Nanaka Kirisato, 6 Years Old
Aired on January 9, 2003

1
Nanaka scolds Nenji for fighting, but he ends their friendship, causing her to fall down stairs. She wakes up with the mind of a six-year-old. Her father asks Nenji to look after her. When she goes missing at the hospital, Nenji finds her at her old kindergarten school and attempts to comfort her.
Episodes
- Ep. 1 · Nanaka Kirisato, 6 Years Old
- Ep. 2 · Nanaka volunteers to play piano for the choir competition despite lacking skills.
- Ep. 3 · Nanaka the Big Sister
- Ep. 4 · Amemiya learns Nanaka's secret and resolves a conflict over Nenji's attention
- Ep. 5 · Nanaka struggles with jealousy as Nenji cares for Kuriko during a stalled date.