Between the two of them, there is a deep and unshakable sibling bond that no one else can penetrate. Tanjiro’s determination to turn Nezuko back into a human, and Nezuko’s fight to protect her brother, both show that they are each other’s greatest emotional support. It is this strong trust between them that serves as the driving force to overcome many hardships.

The timid Zenitsu and the headstrong Inosuke may seem like complete opposites who don’t get along at first glance. However, through fighting together repeatedly, they complement each other’s weaknesses and have built a unique and unparalleled bond of trust. Although they usually argue all the time, their perfectly synchronized teamwork when it really counts truly makes them the ultimate partners.

The compatibility between the two, though brief, is profound—a master-disciple relationship bound by soul. Through their joint battle on the Infinity Train, Rengoku’s passionate spirit and way of life had a great impact on Tanjiro. His words, “Set your heart ablaze,” became a guiding light for Tanjiro’s growth thereafter, living on within his heart.