Dark Japanese Drama/Movie

Off the top of my head:

• Anger (2016 movie)
• Cure (1997 movie)
• Love Exposure (2009 movie)
• Smoking (2018 drama)
• Cold Fish (2011 movie)
• Zekkyou (2019 drama)
• Garasu no Ashi (2015 drama)
• Kenja no Ai (2018 drama)
• Kanata no Ko (2013 drama)
• Karamazov no Kyodai (2013 drama)--yes, it's a loose adaptation of that famous Russian novel
• Tsumi to Batsu (2012 drama)--adaptation of a manga inspired by another famous Russian novel

Please check out the tags before you decide to watch any of these. They might contain disturbing elements.

• Byakuyakou
• Todome no kiss
• Kazoku Game
• Liar Game
• Joker yurusarezaru sousokan
• Zeni Geba

Movies:

Yurigokoro -the main character read abt a narrative abt a serial killer, he was taken aback and somehow drawn to it at the same time.

The Crimes that Bind- this has a drama and other movies, it’s abt a detective who stumbled into a case that might be connected with his estranged mother

Ankoku Joshi- the most popular girl in school belongs to the literature club, and each members holds the secret to her death

Dramas: 

Influence - 3 girls who helped each other by killing for them

Seiren no Zange- a journalist investigates the brutal death of a high school girl

• The Cinderella Addiction
• Dead Stock
• Helter Skelter
• Kyoufu Shinbun: an adaptation/sequel of Premonition
• Premonition
• Pulse
• Tag
• Tales of the Unusual