In the era of the pandemic, all campus activities were stopped and lessons were conducted using virtual meetings. In one online class session, a student named DANU suddenly killed himself after he couldn't stand it due to being bullied by other students. A few days after his funeral, a mysterious form began to terrorize and attack those thought to be responsible for Danu's death. A group of friends and most often bullies Danu, known as The Circle, must choose between confessing their sins or facing a mysterious figure who threatens their lives.