How would you define happiness?
Because, for Wallaby, happiness is when he doesn't get punched in the face by Kokoro, or when she allows him to share her warm bed. After all, she doesn't seem to appreciate the company of a doll with a soul of a dead student from school. The point of this short story is how Wallaby find happiness in the room he wasn't welcome in, and how Kokoro starts appreciating him as a person, instead of a toy.
The 8 chapters are actually all bundled together, and some of them are only two pages long - in reality this is actually about
30 pages long, but that doesn't make it bad. On the contrary, the story is divided pretty good.
Although most of it being in color and often pretty cute, the art is pretty messy, with not much details, and sometimes even a bit looking like a mistake. The backgrounds are very simple, and all in all, it is not good enough for a higher grade, but it definitely isn't an eyesore.
We do not find out much about the characters, considering how short it is, but it is pretty obvious that, while Wallaby is pretty much of a regular, somewhat calm boy introduced as being popular among the girls while alive, Kokoro is one of those typical comedy dumbasses Azuma-sensei tends to throw in in his other works - however she is often amusing, and gradually changes to better.
While it is pretty short, and doesn't offer many of the character background, the thing is, you don't need that to enjoy it. Enjoyment here is found in those silly and comical scenes, in the occasional cuteness, and overall point of the story.
If you're looking for anything short and cute, this is the right thing. It may appear to have romance on the first look, but it doesn't. It is a sweet story of a friendship formed under odd circumstances, and of finding happiness.