Chi's Sweet Home Vol 1

Chi is a michievous newborn kitten who, on a leisurely stroll with her family, finds herself lost and alone. But before she even knows what hit her, the little kitty is picked up and soon under the protection and care of the Yamadas. Every moment of their daily life is filled with something we all can cherish. But their lease explicitly states pets are not allowed in their building...

Source: Anime News Network Encyclopedia