Seishiro Sadow's journey in "Supesharuda" begins with his enrollment in what is often regarded as the worst school in Japan.
However, as he becomes acquainted with the school's story and purpose, he also uncovers the shocking revelation that he possesses extraordinary abilities. Yet, the more Seishiro delves into his newfound powers, the more he realizes that they are entangled with a perilous and enigmatic secret relating to his own identity and the Innocent Sins he has committed.