I have three standout favorite dramas: Liar Game, Liar Game 2 and 1 Litre of Tears. It's really hard to pick, but I'm sure that Liar Game 2 is my all time favorite. My favorite movie is Confessions.
there are close to 80 Japanese movies and Dramas on my list out of those I love Nodame Cantabile the most. I found Tatta Hitotsu no Koi truly romantic Risou no Musuko made me laugh a lot Bloody Monday is my type of drama Zeni Geba---just OMG amazing Orthros no Inu was super cool GOTH, very intriguing and Norwegian Wood beautiful
Almost all my favourite dramas are J-Dramas anyway but so hard to choose just one... But definitely ROOKIES, Nodame Cantabile, GTO (1998 version) and Hana Yori Dango
Love shuffle and kimi wa petto are my favorites
I'm still trying to catch up with Jdrama's but I found Tatte Hitotsu no Koi to be very romantic for a Jdrama. Is this the most romantic one?
Love Shuffle Yamato Nadeshiko Shichi Henge Nodame Cantatbile Hana Kimi Zettai Kareshi
The best? Ikebukuro West Gate Park!
Fav Jdramas: Love Shuffle, Yamato Nadeshiko Shichi Henge, Hana Kimi, Majo no Jouken. Nodame Cantabile Fav Jmovies: Ran, Seven Samurai, Time Traveler, Tokyo Girl, Koizora
Fav jdrama is a tie between Orange Days & Pride. Fav jmovie ... there is one, but I'm not saying. It's not a film appropriate for anyone under age 18 so I won't mention it in a public forum.
Hmmm I have trouble choosing just one favorite, so I'll go with what first pops into my head. It will probably change later.

Movie: Uzumaki
Drama: Last Friends
it's a toss up between Nodame Cantabile and Zeni Geba, opposite ends of the spectrum I know, but both very entertaining.
Movie: Fish Story Drama: Long Love Letter
It's impossible to only choose one, but I'll try to at least name as few as I can:

Japanese Drama: Hana Yori Dango, 1 Litre of Tears & Orange Days.

Japanese Movie: Tada, Kimi wo Aishiteru & Kyo, Koi wo Hajimemasu