Kodocha was the very first manga I read, all the way back in 2005. I remember seeing an ad for the anime, and when I went to look it up, I found the manga and was so excited. Luckily I got mine new, as only a few months later Tokyopop lost the rights and stopped printing them.
Kodocha is probably one of my absolute favorite mangas, and I've read hundreds. The series starts out as a comedy, and a very funny one at that, but along the way the dramatic twists and turns take this series to a whole new level. It has just the right mix of comedy and drama to keep you addicted. I've read this series over and over and over, seriously, I've read it so many times I can probably recite the story word for word.
My only qualm with this series is the rushed ending, as I said in another review, 90s shoujo manga was plagued by rushed endings. In Kodocha
Akito moves to the States, and the span of 3 years is shown by like 2 pages. It ends right when he comes back, so you see almost no time with Sana and him as a couple. Not to mention he was with Fuka way too long, and Sana was too air headed to notice her feelings.
Even with the annoyances, Kodocha is a must read manga, and a great way to start reading manga. If you want a hard copy of the book, you may have some trouble finding it as it has been out of print for a couple of years now, although I always see copies at my local used bookstore. If you can't find it there or don't have one where you live, then check ebay or overstock or the like, you'll probably find it there.
No matter what way you find it, read it!