Back in the beginning of the year, I bought a book called Let's Cook Japanese Food by Amy Kaneko. It's full of amazing imagery and great descriptions of everything you need to make the perfect Japanese dishes. I highly recommend picking it up from Amazon if you enjoy the cuisine and want to make simple meals yourself.
My new favorite thing to cook at home is oyakodon. While I loosely follow the recipe, I find that making my own small tweaks makes it even better.
(Unfortunately this isn't a pic of the oyakodon I made! It's from Flickr user egseah.)
Oyakodon is "parent and child" donburi, since it involves chicken and eggs. Everything is simmered in a sweet sauce containing mirin, soy sauce, sake and rice vinegar. I like mixing my chicken in a bowl with oyster sauce, corn starch, soy sauce and sesame oil first since it helps thicken everything later in the pan.
I definitely recommend experimenting with your own Japanese comfort food dishes!