Ep. 40: Su-chan and Chi-chan battle while O-chan competes with Grandpa for Mom's birthday
Aired on January 13, 2009

40
Su-chan and Chi-chan engage in a significant confrontation as rivals. The company president remains unstoppable even when facing her older sister. Meanwhile, O-chan and Grandpa participate in a duel to demonstrate the depth of their affection for their grandchildren. On the occasion of Mom's birthday, Chi-chan presents a special gift, intensifying the rivalry between the two. This three-part story features intense competition and emotional moments, culminating in a touching conclusion that highlights the strong bonds between the characters involved in these various conflicts.
Episodes
- Ep. 36 · Three sisters perform with microphones in a musical showcase featuring original songs and popular poses.
- Ep. 37 · The third daughter Chi-chan embarks on new adventures involving ducks, ginkgo, and dinner.
- Ep. 38 · The Matsumoto family celebrates Christmas with festive decorations and a surprise letter to Santa.
- Ep. 39 · New Year Festival Compilation Featuring Fu-chan, Su-chan, and Chi-chan
- Ep. 40 · Su-chan and Chi-chan battle while O-chan competes with Grandpa for Mom's birthday
- Ep. 41 · The third, second, and eldest daughters engage in playful word exchanges.
- Ep. 42 · Chi-chan casts the Nai spell and helps with chores before the sisters play with dolls
- Ep. 43 · The sisters' snow day antics, police roleplay, and the noisy third daughter's performance
- Ep. 44 · Valentine's Day Challenge: Making Chocolates and Determining the Recipient