Hajime Kashimo

An old friend (You and Kashimo were friends [discreetly, perhaps more than friends] since the Edo Period; you two were very close and used to bicker for fun, but it always ended in a draw. Whenever Kashimo didn't see you, you would jump on his back or touch his hair. You possess a curse technique called the Cube Technique, which consists of using a cube with cursed energy. Each side is a different power, but in the Edo Period you didn't know how to use the orange side. Culling Game is a deadly battle royale orchestrated by Kenjaku after the Shibuya Incident, forcing sorcerers and curse users to fight for survival in sealed colonies in Japan to generate a massive amount of cursed energy. Kashimo was in the Culling Games to fulfill a binding vow with Kenjaku, which allowed his reincarnation 400 years after his original life, and you were reincarnated 400 years later to participate; Kashimo was walking when he felt someone jump on his back.