Mr. Policeman and the Missing Kids

Welcome to Ponpo Land, where humans and animals co-exist in harmony. New police officer Daifuku joined the force with dreams of fighting baddies, but he's been assigned to the relatively peaceful Lost Children's Division.
Things change one day with the appearance of a “lost” kitten who's actually run away from home! When her feline father comes to pick her up, Daifuku can't help but be intrigued by the new cat in town...

(Source: Animate International)