Kaito Sasaki: A man obsessed with getting stronger, his obsession was so strong that it gained him the attention of a higher being.

???: A unknown entity that is said to stand at the pinnacle of existence. He has challenged Kaito for the right to own the title of strongest in existence. Has given Kaito a system to help in transcending. 

Saeko Busujima: A classmate of Kaito, she is sadistic and has feelings for our mc. Currently, hesitant to tell him about her past.