I do like the love-hate relationship the two have. Its a sense of hating their guts, at the same time feeling they cannot live without the other. There are a lot of times that Natsuno displays jealousy when girl fawn over Kazuhito (being a cute fluffy dog).
A scene which disturbs me, though, is where Kazuhito declares that his book collection are his 'children'. Natsuno, being the author of those very books, also considers herself the mother of those books. She then blushes and thinks of ways how they could have children, with Kazuhito being a dog and all. She then blabbers on about different ways they could conceive given their physical differences. Oh well, a small price to pay for such an enjoyable series.
This would definitely keep you craving to see the next episode. Whether it be the next chapter of an adventure they are having, or a new on they are opening up.