Kazumi was walking together with Satoko, when she suddenly disappeared. On the next day when Kazumi was walking devastated in town, Tanjiro Kamado approached him and asked him if he can give him some specifics on the situation. Kazumi then showed Tanjiro the place Satoko disappeared, thinking he won't believe him, but Tanjiro ensured him that he believes him. As Tanjiro picked up the scent of the demon and ran after him, Kazumi followed him, but was surprised on Tanjiro's physical abilities. Tanjiro managed to save a girl from the demon and entrusted her to Kazumi. After some fight with the demon, Kazumi told the demon to return Satoko, the girl he took last night. The demon the showed his hairpin collection, stating that if her hairpin is there, it means he devoured her already and Kazumi recognized Satoko's hairpin. With Nezuko's help, Tanjiro defeated the demon. He then checked if Kazumi was alright and tried to comfort him and no matter the loses, he must continue living. Kazumi still going through the realization of his dead fiancée, questioned him how could Tanjiro understand him. But as soon as he saw his face, he realized he had loses too and as Tanjiro was leaving, he gave him Satoko's hairpin. Kazumi tried to apologize, thinking to himself that a young boy shouldn't have been in such situation as Tanjiro.
Abilities and Powers
As an ordinary human, he doesn't possess any additional powers or abilities.