Riddle Story of Devil
悪魔のリドル (original)
The "Class Black," 10th Grade of Myōjō Academy is composed of 12 assassins disguised as students and one target: Haru Ichinose. Fully aware of being the prey, Ichinose vows to survive assassination attempts and graduate from the school alive. One of the assassins, Tokaku Azuma, has started building up feelings for Ichinose and switched side to become her protector. Together they have to face the onslaught from their classmates of 11 assassins.
Starring Ayaka Suwa, Hisako Kanemoto, Yoshino Nanjo, Azumi Asakura, Mami Uchida, Sachika Misawa
It's a action & adventure and animation show, and has a rating of 6.2 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from United Kingdom.