Happy Sugar Life
ハッピーシュガーライフ (original)
Satou Matsuzaka, a girl who has never loved anyone before, falls in love with a girl named Shio Koube. The two girls are drawn to each other, and begin a happy life together. Satou won't let anyone endanger their new life, and would do anything for love, even if it means threatening, confining, or killing someone. Don't miss this psychological horror series about sweet and painful true love.
Starring Kana Hanazawa, Misaki Kuno, Yumiri Hanamori, Natsuki Hanae, Aya Suzaki, Kaito Ishikawa, Kikuko Inoue, Ikumi Hasegawa
Watch "Happy Sugar Life" on Amazon Prime released in 2018. It's a animation and crime show, and has a rating of 6.5 out of 10 from Imdb which is usually fine for this kind of show.