Having gotten separated from Natsume while out on a stroll, Nyanko-sensei comes across two young children who got lost on an errand for their mom. While Natsume keeps looking for him, Nyanko-sensei has his paws full keeping the children safe and trying to figure out what the place is they were going to.

Source: ANN

Note: this anime DVD has a completely original story not told in the manga or its earlier anime adaptations. It was given to subscribers of LaLa and LaLa DX magazines.

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Parent story: Zoku Natsume Yuujinchou