Just finished watching Keiji 7 Nin (7 Detectives)...
Really like it, a little of Galileo and After Dinner Mystery vibes...
Hope season 2 is nice as well...
for investigative type of dramas, can try:
Control ~ Hanzai Shinri Sousa
Joker: Yurusarezaru Sousakan
Doubles
Beautiful Bones
Strawberry Night & its prequel SP movie
Boss 1&2
Crisis
On: Special Agent Hinako Todo
Mozu 1,2 & SP
Kiina
Hard Nut!
Absolute Zero 1&2
for family type of drama:
Mother
37.5 no Namida
Mother Game
Kazokugari (pretty dark)
Saikou no Jinsei no Owarikata ~Ending Planner~
Kaseifu no Mita
Dear Sister
for revenge type of drama:
Kurosagi
Guilty, Akuma to Keiyakushita Onna
Boku no Yabai Tsuma
M no Higeki
Alice no Toge
Ouroboros
check out dramas from WOWOW, they are on avg 5 episodes per drama, story is better and darker than the avg jap drama, just that its pretty hard to find subs for them.
Can try these for a start, these have subs
Ishi no mayu
Suishou no Kodou
Bunshin
Kageri Yuku Natsu
Cold Case
Rakuen
The Hippocratic Oath
Yami no Bansosha
from 9-5, dear sister, jimi ni sugoi, shitsuren chocolatier
all ishihara satomi dramas haha