Brutal: Satsujin Kansatsukan no Kokuhaku
Ongoing | Koga kei,Izawa ryo | 2019 released
Dexter but in Japan
Caste Heaven
Complete | Ogawa Chise | 2014 released
Miss Guillotine
Complete | gaje,stego | 2016 released
If Sailor Moon and her friends were manipulative, sociopathic bullies
Watashi no Otto wa Reitouko ni Nemutte Iru
Ongoing | yazuki misaki,takara hyaku | 2019 released
After murdering her husband, he appears to her the next day (despite his corpse still being dead). It's basically a loop at the end and I can't believe she murdered Sou too (though he could have been Ryou pretending to be Sou. Mind melting) :(
Suicide Notes Laid on the Table
Ongoing | Minami toutarou | 2019 released
Class gets mysterious rankings, Ranking #1 Popular girl kills herself, classmates try to figure out why through the letters that she sent. And full circle is met at the end
Zankoku Na Kami Ga Shihai Suru