I'm looking for jdramas that has romance and a serious theme, not a romantic comedy. Older dramas are preferred however if it is good you can list some new ones as well.

  • Boku no Yabai Tsuma
  • Byakuyako
  • Hirugao
  • Kamisama Mou Sukoshi Dake
  • Kuzu no Honkai
  • Last Friends
  • Majo no Jouken
  • Nagareboshi
  • One Million Stars Falling from the Sky
  • Platonic
  • Saikou no Rikon

These are the ones that I've watched. I have some more on my ptw list that fit your criteria but can't say if they're good or not

 mecchaumai:
Soredemo, Ikite Yuku

Its good but I don't count it as a romance.

Here is some couple of J-Drama with romance and melodrama themes:

1 Litre no Namida

Boku no Ita Jikan

Dear Sister

Hirugao

Gomen, Aishiteru

Ninkyo Helper

Guilty Akuma to Keiyakushita Onna

Love Relationship

Deep Love

Kou Kou Kyoushi 2003

Pride

Byakuyakou

1 litre of tears

Algernon no Hanabata

Nagareboshi

Love shuffle

Love Song

Love that makes you cry

Soratobu Kouhoushitsu

Mars

Buzzer Beat

Boku no ita jikan

Taiyou no kisetsu