Goumon Tournament

A high school student named Shunsuke Ohta encounters a man who looks just like him and watches him die by suicide at a train station. The following day, Shunsuke is taken against his will while returning home from school. Upon waking, he discovers he is locked inside a cage where individuals known as torturers participate in a competition to extract secrets from their victims as quickly as possible, referred to as the "Torture Tournament." Shunsuke enters into a conflict identified as the "White Prince" against an opponent called the "Black Moon."