What You Gave Me
Rin, Kuro, and Mimi spend the day at various shops searching for a birthday present for Aoki and even buy a book of charms. However, after Rin runs out of money, they decide to stay over at her house for the night to make presents for him instead. There Mimi meets Reiji for the first time and falls in love with him. Kuro makes a voodoo doll of Aoki and Rin makes herself as the present. The next day, they go to school to give Aoki his presents.
Aired 12/09/2007EP 1 - What You Gave Me

Kodomo no Jikan OVA
A series of OVA episodes released with the limited edition manga volumes.
Episode 01: What You Gave Me (Anata ga Watashi ni Kureta Mono)
Kokonoe, Usa, and Kagami go shopping for a present for Sensei. Eventually Kokonoe decides to make one and they all end up spending the night at her house. Along the way we learn more about Usa's love for Reiji, Kagami's love for Kokonoe, and Kokonoe's love for Sensei.
Episode 02: Kuro-chan, Shiro-chan (Kuro-chan to Shiro-chan)
Kuro-chan tries to become friends with Shirai-sensei.
Episode 03: A Child's Summer Time (Kodomo no Natsu Jikan)
The girls, Aoki and Houin go into the country to visit Aoki's family.