Chi's Sweet Home: Chi to Kocchi, deau. (2010)

Father buys a collar for Chii but seems to have some trouble adjusting its size. Chii gets bored with his attempts and goes for a walk in the park where she meets Kocchi near the fountain. Kocchi wants to drive her away from what he considers his territory. However, Chii is utterly clueless about that and simply wants to play with him.