I only have the first book (since that's all that's released until March 2010. Damn Viz >_>), but I already love this manga D:
I highly recommend it to anyone that's looking for a good read.
And where is the category for it?! GAAAAAAAAAAH.
*insert major facedesk here*
Yay for Tegami Bachi!
(For Miss LuluSeason, because if it wasn't for her, I would have never even considered touching this book!)