Poyopoyo Kansatsu Nikki

Poyopoyo Kansatsu Nikki is a Slice of Life manga by Rū Tatsuki about a spherical cat named Poyo who is discovered and adopted by a young woman named Moe. Much cuteness ensues.

An anime was made in 2012, in two minute episodes which can be viewed on Crunchyroll here.

This series provides examples of:

 * Akira Kamiya: Yes, that Akira Kamiya. He plays both the father and the old woman (and yes, you read that correctly.).
 * Animals Hate Him: Poyo only seems to use his claws on Hide.
 * Beware the Nice Ones: Poyo is a sweet animal, but mess with Kurobe, and he'll make you regret it.
 * Big Ol Eyebrows: Sato
 * Butt Monkey: Hide
 * Cats Hate Water: Averted; Poyo doesn't mind baths.
 * Cuteness Overload: Everybody towards Poyo.
 * And there was the image of Moe thinking of kitty version of Poyo that cause her to nosebleed.
 * Cuteness Proximity: Everyone towards Poyo, naturally.
 * Every Episode Ending: "Poyopoyo! Nya!"
 * Eyes Always Shut: Hide
 * Idiosyncratic Episode Naming: Every episode has the word "Maru" somewhere in its name.
 * Large and In Charge: Poyo. He's apparently seen as a sort of boss around town among the animals.
 * No Mouth: Hide
 * No Name Given: The old woman who lives next door, is never referred to by her name.
 * Panty Thief: Poyo in episode 13. They apparently make comfy bedding material.
 * Ridiculously Cute Critter: Poyo
 * Slap Slap Kiss: Poyo and Eri during episode 18.
 * Theme Naming: The four kittens left on the doorstep. Lemon, Strawberry, Apricot, and Plum.
 * Viewer Gender Confusion: Poyo is a male...yet somehow, he's able to nurse kittens.
 * Yonkoma: the original manga