Akuma no Riddle

At an exclusive all-girls boarding school, thirteen students are part of Class Black, twelve of whom are trained to kill. Their target is Haru, a cheerful student determined to graduate alive. Tokaku, a new student and skilled killer, arrives with the intent to kill Haru. However, she struggles to carry out the task, leading to an internal conflict. As tensions rise, Tokaku must decide whether to protect Haru from the other students or complete her mission before they do.